I'll buy a set. Aluminum, plastic, steel, wood, rubber, scrimshaw, I don't care as long as they fit, mine isn't a show car.
Currently I just have the original broken plastic pieces wrapped in duct tape and jammed back in the hole in the header. I could engineer a better solution, but I've got so many other projects going on I'd rather just let someone else figure it out and pay them.
I would prefer an easy replacement, something I could just drop in with some adhesive without having to disassemble the header.