Started the following thread: SMB RB50 Penthouse's under trim: Replace?
Sportsmobile does sell a trim and rivet kit
for complete trim replacement, ~$250.
However, with the pop top shell 20+ yo, I am reluctant about replacing the trim, I might crack the fiberglass replacing the rivets.
Possibly a recommended way to repair only the damaged segments of trim that are split, instead of replacing the entire trim?