I took this car apart so long ago, I forgot which seatbelt bolts go where! I've got 8 total, 2 of which have about a 1/2" shoulder on them near the head of the bolt, 2 w/1/4" shoulder, and the remaining four are threaded all the way up to the head of the bolt. Which ones go where? I've checked the manuals and didn't find a good picture or explanation. Anyone know?