I can tell you that for the mains, Robart 630/635, Century Jet Centurian nor Spring Air 400 series will not fit without modification. Out of the retracts I have on hand, the Spring Air is probably the closest to working. You would either have to trim the edges of the retract frames back or cut the glass skin back, plus cut out a portion of the strut channel at the base in order for the retract to lie flat on the rails.