Side seams or the bottom rail? The bottom rail is picky about rocking into the correct slots. The sides just need to stretch. Nearly broke my fingers the first time.
Yes, absolutely. In fact if RC sold a Chinesium one I'd have already bought them. This part is so simple it shouldn't cost more than the lights I'm putting on them. I don't care much about US made unless it's a complex part that I'll need warrantee support from.