rear-sets

These really have a fair amount of up/down twisting flex when you transfer weight around on the bike. This normal? I will be testing these this coming weekend. Not that I want to test this part, but I'm questioning crash-ability of these. Anybody with KTM Powerparts rear-sets - any flex of...

I bought a set of the rear-sets KTM offers for my (street version) RC390 from the catalogue, it's the same that comes on the cup-bike stock. Beware, the directions ask you to remove the threaded collar from the stock piece and put it in the new part, problem is, it is the wrong thread...