Jason,
I believe there are several different style of US spec headlight, but the biggest difference has to do with the connections and fit to deal with the side marker lights. The fog lights, the ones integral to the headlight unit, did not change in appearance (from the front) until later in the 280 series (need verification from the group on this). I think there were three different versions, and there should be a small mark on the unit, AN AJ AD or something like that? More input needed on this.
You might also want to send a question to the ebay seller, to see if they can provide any further information about the codes.
Jonny B
1967 250SL Auto