For just the initial fit, they look really good Randy!!!! The adjustable spring perches work quite well, used them in the Late Model wars back in the circle burnin' days. I don't remember ever having a failure issue with them and we pounded on them pretty hard!!! We also used to use a slider for a rear spring mount instead of shackles, for whatever reason they seemed to add a lot of stability to the rear mount and ended any of the 'spring shake' issues that could come up with shackles... AFCO was our choice of supplier, but there's a lot of companies making them. Just another consideration, heck, what's a few more bucks?????