Did insurance pay for repairs to the vehicle? If so, mention it to them and they should cover replacing it, as I believe you are entitled to having the vehicle returned to the condition it was before the accident. That is the whole point of insurance.
[EDIT] After re-reading...sounds like you didn't have anything done. My comment below sticks.
However, if it would be done out of pocket...if it isn't leaking and is just dented, I think I'd be inclined to let it go.
[EDIT] After re-reading...sounds like you didn't have anything done. My comment below sticks.
However, if it would be done out of pocket...if it isn't leaking and is just dented, I think I'd be inclined to let it go.