Hi,
The retaining bolts are probably rusted and corroded, Plus the factory uses a thread locking compound on them and torque them very tight. You want to use care not to break them off or round the nut off.(Use a quality 6 point socket) Spray the the nuts and studs with penetrating lubricant (Recommend Endura Lube by Castle or PB Blaster). Use your socket over the nut and tap it with a hammer. You may need to repeat this procedure several times.If this does not work you can use heat but try to avoid it if possible ( Heat can damage your flooring and interior trim). I'm attaching schematic and video on how to repair your seat problem below,
Be sure to refer to this it will be very helpful for you. You can do this don't get into a hurry
have patients, Nothing ever goes well with this type of problem when you rush it trust me.
Please let use know if this information was helpful and if the repair was successful.
Thank you,
Joe Terwilliger
https://youtu.be/gGlV8ItzaCg
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Tuesday, December 24th, 2019 AT 3:00 PM