Lou, as you can see from the description, the rear quarter will be from the color line where it goes from the body color to white on the two tone trucks (a better place for a joint than lower on the panel where the panel is basically flatish and hopefully if folks weld it up correctly, less likelyhood of warpage) and from the tailgate opening clear around to the rear door. This would include the compound curve where the reverse light and reflector mount. Where the joint is a factory joint (such as the lower pinch weld) then the appropriate lip will be left to allow the old spot welds to be removed and the new piece attached, if it is not a factory joint then a small amount of sheet metal would be left for fitting.
We have not made any of these as any low demand sheet metal is made on a "paid up" basis ('40 series is "off the shelf"). If Paul would be making sheet metal for all the bits folks ask for he'd have a warehouse full of parts and no buyers!! In fact I told him NOT to make up any of this until there was someone who wants it AND has paid for it. When talking with Paul I discussed what areas of the '55 tend to rust worst and what pieces I thought would have a market. He is also willing to make up rain gutter repair pieces as well.
The first off part will undoubtedly cost Paul more than the $500/side to make due to his guys figuring out how best to make it but the cost will still be $500/side to the buyer as we hope that folks will step up once they see the quality of parts.
If you want a rear quarter, step up to the plate, cash in hand, and I'm sure Paul would be happy to make it. He uses only "Zincor" coated sheet metal to better resist corrosion.