For RC8 center diff locker...Use the Losi diff locker for the L8IGHT dirt oval car and put it in the Losi diff case. Use your Associated bearings, outdrives and diff gear, or a Losi gear if it is the Tooth count you want.
It will all bolt right together and right into your RC8. The bolt pattern on the Losi diff case is very slightly off from the Associated gear, but it is not a problem. It runs perfectly true because the case centers on the gear.
Less that $20 for everything. The CEN locker will not fit in the Associated diff case..I tried. Nor willl the Losi locker fit in the Associated diff case.