Welcome to the the Alpine forum. Are you back in Florida already? (assuming it was you, I met in Provo, UT)
You might check out a few RV supply places for the belt molding. It was apparently a standard product used on many coaches, not just Alpines. There are several references in this forum to the various moldings. Do a "search" and you'll find several vendors referenced.
You can modify your 'signature' in the "User CP" (user control panel) to automatically include the year, length and configuration of your coach. It will help others to answer your questions more quickly and accurately.
Also take a look at the Alpine Coach Association
for more technical information, DIY hints, manufacturer's manuals and various vendors.