I keep all kinds of spares parts in my trailer in case I need something in a pinch and will give or loan any of it to guys I know or get to know at a race but if I never met you before I would have no problem telling you $5.00 for that battery end. Mainly to keep you from coming back and needing some tape two wrenches a washer and some tranny fluid. I would never ask someone what its worth to them but I would sell it to you for what it would cost me to replace it.

You bought a part from a vendor, get over it.