Early 904 to later slant six conversion.

transman said

The diameter of the hub is 1.550", I think that there is only one flex plate. A converter builder can make the front (engine side) cover with the proper sized hub. I know that some have suggested the bushing, but personally I'm not a fan of doing that. Good luck.

Click to expand...

Why don't you like the bushing? The bushing is a lot less mony that a special converter mod.
PS: there is also a late flex plate, and an early flexplate. The bolt pattern is the same, but the center hole is a different size.
PPS: The early flexplate with the small center hole is getting hard to find, but there is an adapter bushing to enable the late flexplate/flywheel to be used on the early crank.