Gaskets for shorty MAC H pipe?

Hi, I have mac longtube headers on a 93 5.0 and a shorty mac O/R H pipe that I had to have 2 cats welded to. Now I want to go back to the O/R pipe but I also want to keep my catted H pipe for emissions.

So I'm going to buy a used shorty Mac O/R H pipe. My question is, will I need gaskets to avoid leaks? If so, where can I get them? Does anybody else have mac longtubes and H pipe that can help me out?

Thanks!

Great! So I can just bolt up the H pipe to the headers and the catback with nothing but the H pipe and the bolts?