Originally Posted by Illusion
It's a 93 bluebird
Make sure whatever you use has a fairly snug fit, you don't want any slop or play.
IIRC, 1.25" square tubing is what MuddaEarth and others with BB's have used to fill in the ribs for a roof raise.
Or you could do what I and some others do and have channel made that fits in the ribs real nice.