It just keeps the door from flexing out too far and makes sure when it shuts ,the latches are lined up and the door shuts squarely. Should not be too much of a problem, but if your bottom bracket ever broke while your were driving, you would lose the door.

The s10 guys use the Cavi seats alot. They are supposed to be bolt in for pretty much any Chevy/GM.

Be sure to leave the doors open when your letting the glue dry. If you close them, the van will heat up and push the windows out.

Thats odd, I have the same year ( Safari ) and I don't think I've ever seen those things from the first two pics..

I thought this was the only thread about your swap? I know you didn't start it, but there are pics of yours there.

EDIT: The original link is no longer active,zam