If you are gonna buy a set INSPECT them in person before buying them.
I went to a Major supplier of them where they had Many in stock and they allowed me to hand pick the ones I wanted. I was amazed and blown away by how badly they are stamped on the Partial panels.
Like the manager of the store said "There made in China what do you expect"
It says GM restoration certified on the Box I said I expect MORE? I expect a part that's made correctly! I changed my mind about panel replacements in my restorations right then and there! If OEM original parts are not available any of the aftermarket parts are only good for cutting up and using as Patch panels to repair originals. I will never put a full aftermarket panel on any car.
My opinion is of the same on many other aftermarket Junk sold and advertised by Magazines and Internet sights empty promises and products that don't perform as advertised.