From Team Associated:
For use on RC10B74 to replace 5x12x0.2mm in #92132. This shim will resist coning under load and prevent the differential from binding.
#92137 – $5.99 MSRP
2mm G10 fiberglass chassis brace supports for use on the RC10B74 platform. The G10 fiberglass is more flexible than carbon fiber and can provide more forgiveness on bumps, more fluid cornering, and more rear grip.