http://pro-touringf-body.com/chassis_components.html
The problem is the company/guy can be a PITA to get a hold of. Don't order w/o talking to them.
The GW ones:
Jegs,
ATS carry them. I have these. Don’t order from GW, I have heard horror stories regarding their (lack of) customer service. And their instructions are el sucko. But those topics are detailed at NastyZ and Pro-Touring.
The CE ones:
The kit is a bit ‘sparse’ and IMO is an inferior design. Just like their subframe connectors. I guess 20 years ago that is all there was.
How is the rest of your suspension? Ball joints, control arm bushings, etc.?