Looks like it (Roy's car) has RS front wheel well moldings. I can't see the rear good enough to tell if they short as well. Are you pretty sure they're original ?
Have seen a few non-RS Z/28's with rear moldings cut short (like RS), but front moldings were long and have heard they were factory. I don't know, just seems odd to me. When I bought some NOS over the counter (early 90's), RS was no longer available and had to buy the full length moldings and cut them to fit !