I think that's what the trim piece is called. The piece that goes behind the rear tire. Bonus points for fasteners
This is a 1/4 panel extension I think you might be looking for the ribbed rocker panel trim used on the Skylark Custom models?
Here's the one I have. There's a dent in it that could be fixed. $20 shipped (basically free - just covering shipping) if anyone needs it.
I've seen the long rocker trim BETWEEN the front and rear tires, NOT behind the rear tire. If there is such a thing, it has to be pretty rare. Not sure if I have ever seen such a thing.
Yeah, I think I have seen them, but like I said, I'm pretty sure that they are rare. I know earlier Buicks had them,
I knew I had seen it recently, but could not remember where. Then I thought about Beaver Springs. It was Jenna Nieves' car. A 1971 post car.
My '70 Skylark Custom convertible came with those trim parts and were the first parts removed and gotten rid of. IMO they do not look so good on these cars and as mentioned before - trap dirt and moisture. I think the attaching hardware/ plastic keepers that clip to the weld studs will be the more difficult parts to locate.