ok so here's some details on what I did to get to what you see in the previous pictures, above.
RCM Center Diff/Motor Mount and an Ofna Spider 8 diff with 46T spur
And a Gregers mounting plate (the 7.5 outdrive cups made this assembly very tricky)
8x15x5mm Boca Bearings for the 8mm axles and 15mm knuckles
And some 17mm hexes for the 8mm axles
They're smaller than the 8x16x5mm bearings, but I didn't want to know what someone would charge me to open the knuckles up to 16mm, and I really wanted to run 8mm axles. So the 8x15x5mm bearings are a perfect fix, even though they are sort of hard to find, and very costly (ABEC#1, Rubber seal, 440C Stainless Steel Race, with Ceramic SI3N4 Balls)
-Travis