Give Warrick a call, he has them made locally.
Mine are Factory Fives
4 Port Side Exhaust Uncoated - Factory Five Parts Catalog
but are mild steel, matt black. They used to carry a stainless set but I can't see them on their website now...maybe email them? There are quite a few Cobras fitted with these in Aus. Much cheaper than locally made ones.
Only prob is their fixed length, so if you're insistent on them finishing at the rear wheel arch they'll come up short. There's plenty of argument though as to the "correct" length
Search for other posts on this.......there's plenty of info here
Greg