Anyone know about the '72 Volvo 1800ES?

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See, my stepdad gives vintage cars a full makeover. He is working on a Volvo 1800, but somehow got a set of original Volvo 1800ES factory cast steel wheels in excelent condition, with new potenza tires on them. The will not fit on the 1800, and he wants me to sell them. Now I am well established on ebay selling for others, but Ive never done anything on cars before, only the usual collectables and antiques and such. I know what he would like to get for them, but after spending all day searching on the internet I really have not been able to find anyone that sells these wheels, so I have no basis of comparison. Is anyone here familiar with this make and model of car enough to tell me what these might actually fetch, so that I know weather or not he is aiming way too high? Thanks!!