Dynacorn is the best for steps, I don't remember for cab corners. You want them to have the same radius on the bottom.
And unless you have a good stock truck to lay under you really can't see it on a rusted out one. I forget what brand it was but it looked nothing like factory in that area. And that means what else did they get wrong.
Well just looked at a few I have, I think the dynacorn ones have a hole drilled in the bottom to hang them for paint at factory.
They are the ones I like, but I do have a counterpart that doesn't look too bad either. I have another that is real old and don't know who made it, looks not so good, but can use a piece out of it for a project or two.
