I'll give you both compressor flanges, and it uses the standard funky 5-bolt T2 exhaust housing pattern. The round pattern is a VW thing, IIRC.
The JGS headers look decent. My only qualm is that they use a single piece of metal for the flange. Not ideal. Each exhaust port flange should be separate from the other to allow for thermal expansion. So you should cut between each port (including the stud holes of course) with a band saw, before installing. But after looking closer they use 0.5" thick flanges so that may no be an issue.
JGS's WG's and BOV's look pretty well made too. Maybe you can get all three from them and get a discount - It's worth asking.
