I need clarification of the bolts that attach the transmission to the engine. My truck is a 66 long bed with three on the tree. There is an oil leak thru the front and rear oil seal and I am planning to replace them but I want to confirm that the transmission is attached to the engine with four bolts. The problem is that the two bolts at the bottom do not have head, and they are with a smooth surface that I have a doubt if those two at the bottom are bolts. Please advise.

Thanks

Waddie