Vintage Wheels sells them and may have a set instock.
Since they're 17 miles from you, I'd ask if you could put a deposit on them so you could take them home for a test-fit.
Vintage Wheels
14805 Fisher Cv
Del Mar CA 92014
https://vintagewheelsus.com/index.ph...roducts_id=373
They say they'll fit a 90" WB Cobra and someone already commented on the thread the Butler was pretty true to form.
Their headers and side pipes (raw) are a good deal. $1195
The Ceramic coating is a bit steep, add another $1250 for Silver
But the price is inline with Jet-hot. My quote from last week was. $1750 w/out freight, For Silver headers and White Sidepipes.
You can probably find a local vendor to do them all for $600-700.
Or you could go with a Fab Company like these.
https://www.gpheaders.com/products/cobra-kit-headers/
https://www.stainlessheaders.com/cobraheaders
https://www.shellvalley.com/index.cf...=cat/cat35.htm