Header flanges

Anyone know where to get a good set of CJ header flanges and some merge collectors? I’m going to have a set of headers built and he asked me to get some. I thought about ordering the set from speed way and port matching them to my heads.

Ive been getting all mine through a place called stainless headers mfg. they offer several different primary sizes in stainless or mild steel. They fit the head and ports great too.