Need to replace or repair 1991 CRX SI driver's side seat left back bolster and seat back upholstery. I am open to replacing the entire seat, if necessary.

Looking for ideas, advice and or parts. I have read in this forum an entry that detailed cannibalizing a passenger side seat using it's left bolster and seat back upholstery, but I don't have a spare passenger seat.

I hate to have to go to an after market seat like Corbeau, Sparco, Recaro both because of cost and fitting issues. But am open to thoughts from those who have gone that route. One of my main concerns is preserving the inside seat belt anchor point which appears to be attached to the moveable part of the stock seat slider. Is there a good attachment point to the floor pan in the center of the car?