Red you missed my point. The ones that Finishline sells and are on my and Yeti's cars are DOT
and look more correct than the ones on Archrms SPF. The twist-on lenses are normally used on the front turn signals only, not on the tail lights. It looks like SPF is just using front turn signals with red lenses as brake lights.
You might be able to find some replacements but swapping out the entire light assembly (if you have to) isn't that tough. I can undertand the reluctance however.
I included the orginal pics just for interest, the lower 'light' on the 427 street cars was only a reflector and had a flat lense.