Jon, those bolts are nothing special. They don't even need to be g-8's. They are a very common, course thread, hex head bolt no longer than an inch. Sorry, I don't have the specific dimensions. Be sure to get them good and snug. Too loose and you'll get a sound that is very similar to a low end engine knock while the engine is running. Did you remember to install the starter spacer shim which is critical for proper starter drive gear to flexplate engagement when going from a manual trans to an auto? Hope so.