The gearbox x-member is the factory ke10 and the ke55 gearbox mount just bolted straight up to it, no mods
You won't be able to use the yokes from a ke3x, '55, etc. Their huge compared to the ke10 yokes.
Zowie had the plan of using the tailshaft from the ke38 that he had, but the flange at the diff was different so we had the idea of swapping the flanges over but when we compared the yokes from both tailshafts it was like comparing a 5cent piece with a 20cent piece.
A 30mm spacer and high tensile bolts between the diff flange and the tailshaft flange was also going to be a possible option.