Revo 3.3 Nitro rear brake and slipper clutch eliminator

[75brick]

So...I pulled my old Revo out of storage and started running it again..I bought a rear brake kit for it but the rear shaft is too short and is missing the hole where the pin should go. I'm guessing I need a different one...also I bought a slipper clutch eliminator wlbut that does not work either...sticks out too far...what's going on?

Thanks!!