They'll be fine for mounting the engine on the stand, but I think I'm gonna go to a junkyard and pull some for actually mounting the trans. I can't even find a website that sells JIS M12 bolts. The thing is, they're 17mm instead of the 'standard metric' 19mm head for an M12. I'm not sure, but there may be clearance problems getting a 19mm socket in there, or perhaps Mazda just did it to keep things uniform.
I want to get a 20lb CO2 bottle like the off road guys carry for junk yard duty. When full, it's supposed to be able to run an impact gun flat out for 10 mins or something crazy like that. That sure would make things easier [or possible] with all of the NE Ohio rust...