I'm new to SOI, but have had a 1977 13 ft. for a couple of years. The little research I've done on availability of a replacement ice tray for my factory ice box has resulted in zip.  Anyone out there know of any sources for the slide-in shallow tray that holds a block of ice and has a small drain tube built in? I'm about ready to TIG weld up an aluminum one, but thought I'd ask.