I am finding that many of the vanagons I encounter at are missing the 3
rear headrests. People seem to take them off and lose them.
When I enquired about getting replacements I was shocked at the price of
them (new or used). Apparently they are like gold-dust.

Is it reasonable to ask a seller to reduce the price of a vehicle by
several hundred dollars because the headrests are missing?

Or, should I just look for a vehicle that has them intact?