What's going on with Ebay links?!?! Neither of those are working... The diffs that work with the plastic spur are from the MBX, LX, and Ultra series. The ones from any hyper 7 or 9.5 buggy won't work.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz