Is it legal for my insurance company to not reimburse me for items that were installed on my truck prior to my ownership?

Question Details:

My truck was stolen and I have full coverage comprehensive insurance. It had a 6" lift kit and 35" tires that were installed prior to my ownership.The insurance company saying that they will not include that it the total loss payment.They want to pay me for a stock truck not the truck that I insured with them. To get compensation for the custom parts they said that I need to give them a receipt for custom add-ons and how can I when I bought it that way?

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