Not giving the spanner & Allen wrench with the car would be lame. Holding out on the car cover and mats is not. Any additional option that adds to the purchase price is negotible in the sell. As a seller you want maximum return on your dollar. As a buyer you want something for nothing. These are good reality bargaining items when negotiating final sale price. This is the fun of negotiation - it's your dollars. So long as the seller forked over the money then the sale is final the moment the seller drives away.
Make it a standard item like the air cleaner and then one could truly say "it should go with the car". Make folks pay for it after the fact (as an option on the sticker or over the parts counter, etc.) and it becomes a separate accessory that negotiable rather or not it is included with the sale.
My point:
Really Dodge.....floor mats??? Over $100k and I have to purchase floor mats separately???? No wonder the European car manufacturers laugh at us... Ah well, it's the American way!
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Terms are Net-5 minutes, 15% - now that's America!