Duster Rear Window Louvers

the louvers on that duster are clearly bolt on and not part of the fiberglass body mold . im wondering if there is a way to contact the owner of that flopper
Mongoose McEwen? He retired about 20 years ago, don't think he'd be able to give us much input:D

also, I bet the lines don't really follow the stock lines well enough to be any help to us either...