My Losi 22s drag car is using this types of pins, because I mod the rear from cvd to telescope drive shafts, the drive shafts is using are Traxxas HD Rustler 2wd. The shafts come out from the diff is 4.9, you can use the Traxxas drive not hd and take part you pit hex, you can transform that part in the shafts come out to connect the telescope drive shafts, and also you need the rear knuckles from Traxxas and spacer possible 4mm to take space. I hope this is useful I'm responsible if to many people start the mod