Yeah the pieces will come back off. The body shop said they would install them originally out of the box. However, there was alot of assembly on the Roush parts with paper templates as well as running wiring harnesses etc. I did not want to pay $50 per hour for that. So, I installed myself. Plus this way I can get an exact layout for the new stripes.
When I installed them, most of the parts came with 3m tape as well as screws. I did not apply the tape yet, I'll let the body shop do it. This will make disassembly easier.