Re: YJ - MC2100 Questions.
My two cents is make your own adapter..
The only one I could find was made by transdapt--carried by everyone. This is the same company that makes your crome ignition coil covers. Their unit is really cheesy. It looked as if you accidentally leaned on the carb, the adaptor might just split in two.
I went the mo money route and bought a 1" spacer and a 1/2" Black and decker BULLET drill bit. the bullet bits are the ones with a small cutter in the center and a mostly flat cutting surface. WalMart carries them. The flat cut of the bit creates a nice little pocket for the allen head bolts to sit in. the rest is pretty self explanatory, but if you need help let me know. mine has offered no problems, despite the fact that my holes ended up off target because I used the trans dapt unit as a template!