[Jeff Lee]

This is for your Stocker Challenger? If you are running a leaf spring suspension, then you do not want to run a solid wheelie bar. I tried real hard to make it work and was unsuccessful. Many launches to the wall or centerline. Then I used the AJE wheelie bars and loved them. But then they were deemed illegal for Stock.
I believe the old tried and true leaf spring wheelie bar as offered by Competition Engineering and others is the cheapest, easiest way out.
I've looked at the Ken Kier single wheelie bar that is Stock legal and like the concept. But I'm not sure he has one for a pumpkin style rear end like you have. I doubt it but call him and ask.
I looked at the Calvert wheelie bar today for the first time. I like it. If I were in Stock, I'd buy it. Reason is it takes the same concepts as the AJE wheelie bars (using a rocker for leverage) but in a way that is legal. The AJE required brackets welded to either the rear frame or a crossmember for uprights between the bars and the frame. Come to think of it...as I'm writing this I'm thinking that if the hardware was bolted on then it would be legal. Hmmmm,,,