Originally Posted by tech69
well that's what I meant. you can do your best to fit it correctly but sometimes the aftermarket pos panels will have one flange that hangs over. It's very common. Sometimes the flanges don't want to meet and you have to find ways to make it meet. Sometimes you will feel the rocker wants to teeter. If it fits good on top you have to wrap it around the underside to meet the other flange with a 2x4 and porto. Not common but stuff like that isn't out of the question. Be sure to mock up your fender as well before you weld in that rocker otherwise the trajectory of the rocker might not match the fender. So in order to do this your door should be lined up good to the quarter so the fender is lined up good with your door and that's where your rocker end has to meet nicely with the fender down below. Then once it lines up with your door and fender weld it in.
This brings us to a few good things to do when replacing things like rockers.
First,before you do anything at all you want to make all the adjustments to the door and fender to get the best gaps possible this way you can remove the door and fender if you need too and know they fit right before you started...
Once you have the rocker screwed on and you think its ready to weld you reassemble the door and fender (before you weld anything) double check everything...remember this and you'll never have a problem getting it back together...You dont have to put every bolt back in just a couple,enough to hold it on....Then your ready to weld...