| Optional Top Plate Number | Mounting Plate | Bolt Hole Spacing | Bolt Size |
|---|---|---|---|
| 41ST (FOR 1-1/2" WIDE WHEELS) | 4" x 5" | 2-5/8" x 3-5/8" slotted to 3" x 4" | 3/8" |
| 41RT (FOR 1-1/2" WIDE WHEELS) | 4" x 5" | 2-5/8" x 3-5/8" slotted to 3" x 4" | 3/8" |
| 42ST (FOR 1-1/2" WIDE WHEELS) | 4-1/2" x 6-1/2" | 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4" | 1/2" |
| 42RT (FOR 1-1/2" WIDE WHEELS) | 4-1/2" x 6-1/2" | 2-7/16" x 4-15/16" slotted to 3-3/8" x 5-1/4" | 1/2" |
| 43ST (FOR 1-1/2" WIDE WHEELS) | 5" x 5-1/2" | 4-1/8" x 4-1/2" | 3/8" |
| 43RT (FOR 1-1/2" WIDE WHEELS) | 5" x 5-1/2" | 4-1/8" x 4-1/2" | 3/8" |
| 43ST (FOR 2" WIDE WHEELS) | 5" x 5-1/2" | 4-1/8" x 4-1/2" | 3/8" |
| 43RT (FOR 2" WIDE WHEELS) | 5" x 5-1/2" | 4-1/8" x 4-1/2" | 3/8" |
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| 4" | 1-1/2" | Cast Iron | 350 | 5-1/4" | RK-CIR-0415-S-TG | RK-CIB-0415-S-TG | RK-CIC-0415-S-TG | 1-3/4" | 4.5 |
| 4" | 1-1/2" | Durastan | 350 | 5-1/4" | RK-DUR-0415-S-TG | RK-DUB-0415-S-TG | RK-DUC-0415-S-TG | 1-3/4" | 4.5 |
| 4" | 1-1/2" | GT | 350 | 5-1/4" | RK-GTB-0415-S-TG | 1-3/4" | 4.5 | ||
| 4" | 1-1/2" | Performance TPR | 325 | 5-1/4" | RK-RPR-0415-S-TG | RK-RPB-0415-S-TG | RK-RPC-0415-S-TG | 1-3/4" | 5 |
| 4" | 1-1/2" | Urethane on Iron | 350 | 5-1/4" | RK-UIR-0415-S-TG | RK-UIB-0415-S-TG | RK-UIC-0415-S-TG | 1-3/4" | 4.6 |
| 4" | 1-1/2" | Urethane Polypropylene | 350 | 5-1/4" | RK-UPR-0415-S-TG | RK-UPB-0415-S-TG | RK-UPC-0415-S-TG | 1-3/4" | 5.3 |
| 5" | 1-1/2" | Cast Iron | 400 | 6-1/4" | RK-CIR-0515-S-TG | RK-CIB-0515-S-TG | RK-CIC-0515-S-TG | 1-7/8" | 7.5 |
| 5" | 1-1/2" | Durastan | 400 | 6-1/4" | RK-DUR-0515-S-TG | RK-DUB-0515-S-TG | RK-DUC-0515-S-TG | 1-7/8" | 5.3 |
| 5" | 1-1/2" | GT | 400 | 6-1/4" | RK-GTB-0515-S-TG | 1-7/8" | 5.3 | ||
| 5" | 1-1/2" | Performance TPR | 350 | 6-1/4" | RK-RPR-0515-S-TG | RK-RPB-0515-S-TG | RK-RPC-0515-S-TG | 1-7/8" | 5.3 |
| 5" | 1-1/2" | Urethane on Aluminum | 400 | 6-1/4" | RK-UAR-0515-S-TG | RK-UAC-0515-S-TG | 1-7/8" | 5.5 | |
| 5" | 1-1/2" | Urethane on Iron | 400 | 6-1/4" | RK-UIR-0515-S-TG | RK-UIB-0515-S-TG | RK-UIC-0515-S-TG | 1-7/8" | 5 |
| 5" | 1-1/2" | Urethane Polypropylene | 400 | 6-1/4" | RK-UPR-0515-S-TG | RK-UPB-0515-S-TG | RK-UPC-0515-S-TG | 1-7/8" | 5.3 |
| 5" | 2" | Cast Iron | 900 | 6-1/2" | RK-CIR-0520-S-TG | RK-CIB-0520-S-TG | RK-CIC-0520-S-TG | 2-1/16" | 9.8 |
| 5" | 2" | Durastan | 900 | 6-1/2" | RK-DUR-0520-S-TG | RK-DUC-0520-S-TG | 2-1/16" | 7 | |
| 5" | 2" | GT | 900 | 6-1/2" | RK-GTB-0520-S-TG | 2-1/16" | 7 | ||
| 5" | 2" | High Temp. Nylon | 900 | 6-1/2" | RK-HNR-0520-S-TG | RK-HNB-0520--S-TG | 2-1/16" | 7 | |
| 5" | 2" | Performance TPR | 375 | 6-1/2" | RK-RPR-0520-S-TG | RK-RPB-0520-S-TG | RK-RPC-0520-S-TG | 2-1/16" | 5.7 |
| 5" | 2" | Rubber on Aluminum-EHT | 600 | 6-1/2" | RK-RAB-0520-S-TG-EHT | 2-1/16" | 9.4 | ||
| 5" | 2" | Solid Urethane | 900 | 6-1/2" | RK-SUR-0520-S-TG | RK-SUB-0520-S-TG | RK-SUC-0520-S-TG | 2-1/16" | 7 |
| 5" | 2" | Urethane on Aluminum | 900 | 6-1/2" | RK-UAR-0520-S-TG | RK-UAC-0520-S-TG | 2-1/16" | 9.8 | |
| 5" | 2" | Urethane on Iron | 900 | 6-1/2" | RK-UIR-0520-S-TG | RK-UIC-0520-S-TG | 2-1/16" | 10.5 | |
| 5" | 2" | Urethane Polypropylene | 750 | 6-1/2" | RK-UPR-0520-S-TG | RK-UPB-0520-S-TG | RK-UPC-0520-S-TG | 2-1/16" | 5.7 |
| 6" | 1-1/2" | Cast Iron | 450 | 7-1/4" | RK-CIR-0615-S-TG | RK-CIC-0615-S-TG | 2" | 8.8 | |
| 6" | 1-1/2" | Durastan | 450 | 7-1/4" | RK-DUR-0615-S-TG | RK-DUB-0615-S-TG | RK-DUC-0615-S-TG | 2" | 6 |
| 6" | 1-1/2" | GT | 450 | 7-1/4" | RK-GTB-0615-S-TG | 2" | 6 | ||
| 6" | 1-1/2" | Performance TPR | 450 | 7-1/4" | RK-RPR-0615-S-TG | RK-RPB-0615-S-TG | RK-RPC-0615-S-TG | 2" | 5.7 |
| 6" | 1-1/2" | Urethane on Iron | 450 | 7-1/4" | RK-UIR-0615-S-TG | RK-UIB-0615-S-TG | RK-UIC-0615-S-TG | 2" | 5.7 |
| 6" | 1-1/2" | Urethane Polypropylene | 450 | 7-1/4" | RK-UPR-0615-S-TG | RK-UPB-0615-S-TG | RK-UPC-0615-S-TG | 2" | 5.7 |
| 6" | 2" | Cast Iron | 900 | 7-1/2" | RK-CIR-0620-S-TG | RK-CIB-0620-S-TG | RK-CIC-0620-S-TG | 2-3/8" | 11 |
| 6" | 2" | Durastan | 900 | 7-1/2" | RK-DUR-0620-S-TG | RK-DUB-0620-S-TG | RK-DUC-0620-S-TG | 2-3/8" | 8 |
| 6" | 2" | GT | 900 | 7-1/2" | RK-GTB-0620-S-TG | 2-3/8" | 8 | ||
| 6" | 2" | High Temp. Nylon | 900 | 7-1/2" | RK-HNR-0620-S-TG | RK-HNB-0620-S-TG | 2-3/8" | 8 | |
| 6" | 2" | Performance TPR | 525 | 7-1/2" | RK-RPR-0620-S-TG | RK-RPB-0620-S-TG | RK-RPC-0620-S-TG | 2-3/8" | 7.3 |
| 6" | 2" | Omega | 900 | 7-1/2" | RK-UOR-0620-S-TG | RK-UOB-0620-S-TG | RK-UOC-0620-S-TG | 2-3/8" | 10.4 |
| 6" | 2" | Rubber on Aluminum-EHT | 615 | 7-1/2" | RK-RAB-0620-S-TG--EHT | 2-3/8" | 8.5 | ||
| 6" | 2" | Solid Urethane | 900 | 7-1/2" | RK-SUR-0620-S-TG | RK-SUB-0620-S-TG | RK-SUC-0620-S-TG | 2-3/8" | 8 |
| 6" | 2" | Urethane on Aluminum | 900 | 7-1/2" | RK-UAR-0620-S-TG | RK-UAC-0620-S-TG | 2-3/8" | 8.5 | |
| 6" | 2" | Urethane on Iron | 900 | 7-1/2" | RK-UIR-0620-S-TG | RK-UIB-0620-S-TG | RK-UIC-0620-S-TG | 2-3/8" | 10.5 |
| 6" | 2" | Urethane Polypropylene | 900 | 7-1/2" | RK-UPR-0620-S-TG | RK-UPB-0620-S-TG | RK-UPC-0620-S-TG | 2-3/8" | 7.3 |