The dowels are shouldered on the back(engine) side, originally so I could easily hold onto them and slip them in when the trans lined up. They're 16mm on the part that's in the plate and fits in the trans, and the shoulder is 1" because that was the stock size.

They function just like their counterparts on the 6G72 block, to align the tranny and engine, or adapter plate in this case.

1989 Dodge Power Ram 50 w/ no engine <- rotten frame <img src="/forums/images/graemlins/frown.gif" alt="" />
1988 Power Ram 50 2.6 Long Bed
1990 Mitsubishi MightyMax V6, swapping to the Daimler-Benz OM617 3.0L I5 diesel