Can anyone tell me what these rear seats are out of? 7 full sets brand new. 

MK2 Octy it looks like.

Any idea what they'd roughly fetch per set? 

They look like the ones in mine.

 

Doubt that they have any value as they rarely get used and get worn on most vehicles, an ebay listing with one reserve migh shift one or two sets, maybe if someone was building a special people carrier conversion or something but as they sit on the raised floorpan its not as if they could be bolted into a van or something as an extra row of seats.