How close does the insurance co. have to get to "replac

My truck was totaled and the person who hit me was at fault. His insurance company quoted me a acv(actual cash value)of 6,500 and I disagree with the amount. Blue book value is 8,900.I was told that the acv is figured on what a simaler vehicle is being sold for in that area and availability. I cannot find any cars with the same amount of mileage or add-ons I had on my car for less than 9,000. I asked the insurance Co. to send examples of the vehicles used to determine their acv. I was sent 2 examples, one (7,700)was a year newer with 40,000 less miles but lacked many of the factory extras. The other(5,500) was'nt even close. I then sent them what I had found. The trucks I found in my area,using a 500mi. radius, Ranged from 9,000 to 12,000. They then raised the acv to 6,900. Am I wrong for requesting the info. on how they came to figure their ACV. Can they use the same model with a different year(obviously newer) as an example? Can I request the same color? How close does the insurance co. have to get to matching my totaled truck? where can I find the written leagal guidelines on this matter?