so i was mating the tranny to the engine the other day and i was tighten the five bolts. everything was aligned and matched properly and when i went to tourque them down one got tight then just spun so i pulled it out and the threads were on the bolt, so im not looking to tap and dye it i was looking into a thread insert kit, but idk what size the bolt/threads are on the engine block

 

The 17mm head bolts are M12-1.25



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i dont think i need thta size, i need to know the size for the bolts holes that the bell housing bolts go into....