The main thing that concerns me is the claim of being NOS GM emblems, when clearly they're not. Spreading so much misinformation around confuses people and anyone that thinks the ones that 88hurstolds got hold of were in any way even close to resembling NOS is missing something. Taiwan/China/Malaysia...to me, it's all the same. But the example above is about 10 times better than GBP's offering and probably could pass muster with those not paying attention to the details. It's not like they didn't make a gajillion taillights between 84-88. The 86-88 seem to suffer the worst fates mainly due to fading.
Repopping ain't easy, but you have to do it right or simply don't do it. If I were just piecing together a G-body to drive around or make a nice race car or something, I wouldn't care about the taillight emblems. But if I'm restoring one and want it to look right, those that 88hurstolds received ain't it.
One of the biggest problems with replacing those emblems is getting them out without busting your taillight lens.