Yeah, but when their company says they will ONLY pay for aftermarket parts...what are going to do? When I went through it, that's what I was told. My rear bumper needed to be replaced...they would only pay for a reproduction bumper. I demanded original GM brand. Went around and around and around with them on it. I told them their client didn't hit a reproduction bumper...they hit a GM bumper and that's what was going back on it. They still bucked me...at first.There's no reason for OP to get his insurance involved, the other insurance company already accepted liability.
They also would only pay a maximum of 3 days for a rental vehicle. My truck was in the shop for 5.
Later on, my insurance guy said if I would have filed it under MY insurance, I would have gotten everything handled with zero hassle. Looking back, I should have went that route. In the future, I absolutely will. In GA, filing a claim with your own insurance when it's the other party's fault doesn't affect your rates or insurance score.