Thanks all. That link is helpful. In my situation at least the other party has claimed fault so I can get an attorney if push comes to shove.

They refused compensating me for rims/tires which were only a year old. Their reasoning was that when they did the appraisal it was done with the original alloy wheels - that my upgrades were customer choice and did not affect the value. I argued that the original rims and tires would have been 15 years old and is in no way comparable to set that was installed a year ago.

Digging for comps is getting harder and harder.

I'll check out the facebook group and report back.