Exhaust manifolds, no numbers

There are aftermarket manifolds out there now but those look too old to be repops.
I know a guy who used to make guitars look very vintage even used to be able to get the old original fender decals from the custom shop down here which is now defunct. He said the bodies up on the roof during the summer days. Buy some new ones, grease the flange and then throw out in your yard...and turn the sprinklers on, bury them, for 2 weeks.... vintage...lmao