hit and run insurance question

[RoshDawg]

Hey guys, just walked back to my car after going to the beach and not to pleased with what I saw
There is an actual hole in the rear bumper and the panel right next to it is pretty damaged too. (bumper will for sure have to be replaced)

Question about insurance:
They said I can chose whatever body shop I want and they (the insurance company) will take care of the estimate/payment and everything else. However, I was already wanting an aftermarket bumper, can I just have the insurance cover that? Can I just chose a Nissan body shop and have them replace it with a nismo bumper or something? (dont worry, I would remove the nismo emblem if it came with any)
Any info or past experiences on this situation would help as this is my first collision problem

Thanks for the help