Unfortunately, there's not much available. Off the top of my head, I think Andys, AED, & MPD are the only ones left. SLP, once a major supplier, abandoned the GM W-Body long ago.
Might I suggest you spend a little time at clubgp.com. There is an abundance of info there. I was a member when I had my GTX:
Might I suggest you spend a little time at clubgp.com. There is an abundance of info there. I was a member when I had my GTX:
