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| HPI Nitro RS4 3 Rear Universal Axle Set | $ 12.49 |
| GPM Alloy Rear Arm Set fits HPI Nitro RS4 3 III | $ 10.90 |
| DuraTrax Suspension Arm Set Rear Nitro Evader ST (2) | $ 4.99 |
| DuraTrax Suspension Arm Set Rear Nitro Evader ST (2) | $ 3.99 |
| HPI Nitro RUSH EVO Truck Rear Suspension Mount Set -NEW | $ 3.99 |
| GPM (#NRS3022) Alloy Rear Knuckle Arm Set HPI Nitro RS4 | $ 9.90 |
| DuraTrax Nitro Evader ST Ft & Rear Suspension Arm Set | $ 0.99 |
| NEW HPI NITRO RS4 3 EVO+ Arms Rear Set HR2R | $ 1.99 |
| NEW HPI NITRO RS4 3 EVO+ Hubs Front & Rear Set HR17 | $ 5.99 |
| NEW HPI NITRO RS4 3 EVO+ Arms Rear Set HR2R | $ 2.99 |
| NEW HPI NITRO MT2 MT 2 18SS+ Arms Rear A-Arms Set HM2R | $ 1.99 |
| DuraTrax Nitro Evader ST Ft & Rear Suspension Arm Set | $ 1.04 |
| NEW HPI NITRO MT2 MT 2 18SS+ Arms Rear A-Arms Set HM2R | $ 0.89 |