I need a seat belt extender

That's better Roger.
Question edited for maker and tidied up a bit.
Question moved to sub category.

It sounds like you need a Stud Extractor Tool

https://www.google.com/search?q=stud+extractor

The videos _may_ show tricks

https://www.google.com/search?q=1996+Buick+Park+Avenue+belt+change

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test switch and recline motor. replace as needed

thay r bolted with a sigle bolt often star head if you can fit a tool in to get at it than no you may be able to push the seat forward to get more room

All front seats are bolted to the floor unhook all powerwires fom the motors under the seat then find the socket size of the bolts and remove the seat this is usualy the same on most vehicals hope this helps : )

for bottom seat you have to push on the lower part of seat about 4-6 inches from corner of seat.

try holding up on seat from bottom and use palm of hand to hit it until it comes up.

for top back of seat you have to take out bolts at bottom.

you will see them when you take out the bottom seat.

after you get bolts out you need to push up on the seat to get off the hangers in back.

don't forget to vote for me.

thanks

dont know what size but a quick visit to scrapyard should cure it

Click on the following free, direct Link. It has several Belt Diagrams including the Belt Diagrams for your 1996 Buick Park Avenue Ultra with the 3.8L V6 Super Charger.

Scroll Down the Link Page about 2/3rd down for your Diagram (G00005648).

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

http://www.2carpros.com/car_repair_information/year/1996/make/buick/model/park_avenue/1996_buick_park_avenue_drive_belt_routing_diagram.htm

Seat belts are usually not repairable.The only thing that can be done is to check and make sure nothing is stuck in it or that it is not twisted.You have the kind that is in the seat back itself.These are a little more difficult to remove from the seat because it is so easy to break the plastic trim covers.Best thing to do if not familiar with auto repair to go to the dealer or auto repair shop that you trust and have them repair it.Good luck.

the belt routing diagram should be under the hood someplace....also is in the owners manual ....or goodyear belts have belt routing info on the back of packaging...good luck...Lee

My sincere apologies for the delayed response.
I am personally going back to answer your unanswered questions.
I have only been a free contributor to this site for the past 4-months.

I do not know if you still need this information, but I am going ahead and answering it anyway.

CLICK on the following LINK. It has the Belt Diagrams you will need.

Standard Rules for Removal of the Serpentine Belt:
1. Find the Tensioner(s). (See Diagrams on Link)
2. Rotate/Move the Tensioner Pulley/Arm away from contact with the belt and towards the area where the belt is not in contact with the Tensioner Pulley. The Tensioner is spring loaded, and is hard to rotate/move.
3. Remove the loosened belt off one of the other more easily accessed Pulleys.

Let me know if this helped.

http://www.2carpros.com/car_repair_information/year/1996/make/buick/model/park_avenue/1996_buick_park_avenue_drive_belt_routing_diagram.htm