OK, I e-mailed Jerry Weigt, the gent that posted the info about the export flywheel. This is the response he sent me (with pics too!).

"Greg: I received a 4.2 flywheel from GM’s beta-test program. I later found that this was an “export only, not available in the U.S. ” item. I had a machine shop make copies in billit steel. It uses the starter ring gear from the Chevy Colorado or GMC Canyon 4 or 5 cylinder with manual transmission. It uses the metric pressure plate from the 5 cylinder and is also drilled for an S.A.E. pressure plate.

If this would work for you, I’d be happy to provide one for the sum of $275 (plus freight and tax, if applicable). I’ve attached a front and back picture.

I would be happy to chat with you. You can contact me at (530) 795-0224 most evenings.

Jerry Weigt
weigts@sbcglobal.net"

Well, there you have it. A source for 4200 flywheels. I can't post pics so if anyone wants a pic, send me a PM.

Greg