DanJenn:
I tried them out with my MagnaPacks and they worked quite well -- for a while. The fiberglass matting blew out a few strands at a time until most of it was gone.
I am going to try stainless steel wool next. It has very good acoustic damping properties but I haven't had much luck finding the s.s. wool in less than 5 lb wad.
I suggest that you call Bassani and relay my sad tale and ask if they have any suggestions. I gave up on the baffles and am back to enjoying the roar (but some of my dearest passengers don't like it!).