LOSI XXX DIFF OUTDRIVES, HELP!!

[extrememacko]

Ok so I bought a pair of diff outdrives for xxxcr, apparently, but the bearing shoulder was very long so the gearbox case can not close...

... So I buy another pair, the correct ones?.. No! This time bearing shoulder correct length but no D-shape to fit diff rings, just rounded!!!!

How many XXX outdrives are there, Gen1 Gen2 Gen-wrong whats going on????!!!!!!

Which ones do I need???

C'mon Losi experts