The front of the seat has hooks on it which attach. No bolts. The seat will hinge up. Here are the directions for removal and replacement of the seat. The attached pics correlate.
2001 Buick Park Avenue V6-3.8L VIN K
Vehicle Body and Frame Seats Service and Repair Removal and Replacement Seat Replacement
Caution: When you are performing service on or near the SIR components or the SIR wiring, you must disable the SIR system. Refer to Disabling the SIR System. Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.
1. Move the seat to the full-rearward position using fore/aft switch on side of seat.
2. Remove the front track cover cover.
3. Move the seat to the full forward position.
4. Remove the riser cover (1).
5. Remove the seat to floorpan bolts (1).
6. Tilt the seat forward.
7. Disconnect the rear heater duct (if equipped).
8. Disable the SIR system. Refer to Disabling the SIR System in SIR.
9. Disconnect the remaining electrical connectors.
10. Remove the seat with aid from an assistant.
Important: Prior to installing the seat, verify that the area where the hooks engage is not deformed or raised. If the sheet metal is deformed, re-flatten the raised sheet metal using an appropriate device, such as a ball peen hammer.
1. Position the seat in order to align the hooks in the slots, with the aid of an assistant.
2. Tilt the seat forward.
3. Enable the SIR system. Refer to Enabling the SIR System in SIR.
4. Connect the electrical connectors.
5. Connect the heater duct (if equipped).
6. Move the seat forward using the fore/aft switch on the side of the seat.
Notice: Refer to Fastener Notice in Cautions and Notices.
7. Install the rear seat to floorpan bolts (1).
Torque the outer bolt first then the inner bolt (1) in order to secure the seat to the floorpan.
Tighten the bolts to 35 N.M (26 lb ft).
Important: Ensure that the adjuster tongues are under the track.
8. Install the rear riser cover (1).
9. Slide the seat full rearward using the fore/aft switch on the side of the seat.
10. Align the front trim track cover to the seat track.
11. Push the cover inward to secure.
12. Reposition the seat.
Let me know if this helps. I did note that step one is to move the seat fully back. Ugh! You should be able to still get it.
Images (Click to enlarge)
Monday, February 10th, 2020 AT 7:15 PM