I dont know about his rear suspension. I did purchase his front set up. Carl has been great to deal with. Always has time to talk on the phone and also responds quickly to any of my dumb questions if I email.

I would call and talk to him.

I will say that when I was looking at front kframe set ups he was the only one that actually spoke w/me. The other company that has a similar product never answered the phone or even returned my phone call or emails. Made my decision pretty easy.