Seriously, I was looking at these for a friends 240, but not at the price you are trying to get.
And since they look to be AP1 seats, and been on more than one car, first being the S2k, and then yours
they have had some use on them.

The best you could get would be between $400 and $600 and that is being generous.
And as Blown_SS Stated, only a retard would pay $900 for them.

Good luck with the sale.