Installed 2005 Sunfire seats I picked up from local junkyard this past weekend for $50. Bought the driver side seat only (no hardware) and the passenger seat with the Sunfire track.
Both Sunfire seats bolted right onto the YJ ('91) stock risers/sliders/brackets without any modifications. However, my passenger side seat riser/bracket had rusted and damaged sliders which I could not reuse with the Sunfire seats. Therefore, adapted the Sunfire sliders onto the YJ riser.
New seats do ride a little higher, but definitely more comfortable than previous seat. Previous seats (both) back side were broken and would recline backwards on their own. PO had installed a horizontal pipe across the back to keep them in place.
In the end, happy with the results. Now only need some seat covers.