From Factory Team:
New from the Factory Team brand are optional carbon fiber inserts for the Team Associated RC8B3.2 suspension arms! These 1.2mm thick carbon fiber inserts replace the stock plastic inserts and offer improved stiffness and a clean Factory Team look.
Fits: RC8B3.2 and B3.2e suspension arms #81434, 81438, and 81442.
When switching to the new carbon fiber inserts, a shorter M3x6mm (#31541) FHCS is required for mounting to the arm.
#81436 – RC8B3.2 FT Rear Suspension Arm Inserts, carbon fiber, 1.2mm – $29.99 MAP
For suspension arms #81434
#81440 – RC8B3.2 FT Front Suspension Arm Inserts, carbon fiber, 1.2mm – $21.99 MAP
For lower front suspension arms #81438
#81444 – RC8B3.2 FT Front Upper Suspension Arm Inserts, carbon fiber, 1.2mm – $13.99 MAP
For upper front suspension arms #81442