I have insurance companies call me all the time for information like this. Tell your insurance company what you want and tell them to contact a couple of dealers to find out an accurate number for the diminshed value.
NOT all insurance companies are the same. Good ones will do this for you. USAA and State Farm come to mind right off the bat of ones that have contacted me recently. It would however be inapporpriate of me to recommend one insurance company over another. Not my place to do so.
Best of luck!
