VII's came with a suede bolster and black or blue internal seat panels. Haven't seen any other colours. Bolsters on these are supposed to be the highest including the "wings" at the lower portion around your kidney area.

VIII's including MR came with a very similar and possibly the same seat, again in suede bolsters but some people think they are a bit tighter (subjective I feel).

IX's came with a leather type bolster but were termed the "fat american" seat and offered little support of any kind for a car like that. Very flat seat.

Having owned a VII and an VIII MR, the VII seats get my vote.

HTH