Tru-Flex Bumbers & Tail Lights

Just finished mounting two tail lights (Brake and Backup). Didn't know what I was in for because they did not mount like they did before. Has anyone had difficulty remounting? I had to modify the brake lights by removing part of the plastic stops on the back. Found out from a web sight not to reuse old taillight brackets and bolts. Ture-Flex is stiff enough not to have to use the brackets. Just FYI if anyone changes their bumpers out. Thanks