Phil:
Am going to post the answer herein for the benefit of anyone who might be
scratching for the answer in the future.

Bolts are 12mm X 1.5 thread pitch.  They are approx 2 5/8" long (66mm).

Thanks,
Brent

note:  Have a picture posted for the time being out at
http://www.weidefamily.net/Vanagon/Pending_Content/trannycooler/BanjoTrannyB
olt.jpg