the ones you get are made on a brake and common bend and thus the J is missing and also many do not realize the slight curve is supposed to be in place along the length.....these were pressed units, I have only found one set of NOS factory panels. I have bought from some companies that the units were pure junk, others that were usable but again, there is no true J and not seen the proper curve in the P15's either. BUT knowing up front the short comings, you can do a good job taking your time correcting on the fly when welding in. If you need a full rocker, yes buying one is a good start....if just a patch here or there...short section of the rockers is a relatively simple task. DIY does show the curve in their product, the do not show a J as to the correct box..cannot speak for that as I have not used their items. But currently there are three sellers on e-bay now. (suspect one company is selling under two names)