DiscoDavis
Explorer
Receipts! You can be reimbursed for all of that plus labor. If you're really nit picky, you can even get reimbursed for the fuel in the tank...
Depends on insurance. Some carriers consider almost every modification a "personal preference" item and are only covered in case of theft, not total loss. Be very clear with insurance when asking, some will say it is covered but fail to clarify for theft vs loss etc.