My driver seat would rock down while braking and back while accelerating. I removed the seat and found that these 2 allens bolts are the culprit. One on each side. The swivel 6mm allen driver is useful as im not sure you would get a regular allen wrench in there.

 

Slick.

 

this is great timing, my seat has the same issue. Is this something that can be done with the seat still in the truck? Where are the bolts, near the front or back? Thanks!

 

They are near the front, and you have to take the seat out to get both sides. The seat comes out very easy. Move the back of the seat in the most upright remove the 5 plastic screws and 4 seat bolts plenty of room to get it out.