Extending front seat travel

Has anyone done any modifications to their AMC cars to move the front seats further rearward ? I must have grown longer "legs" in the last 50 years because even with the front driver's seat at the end of it's rearward travel, I'm too close to the steering wheel in my 67 Ambassador DPL hardtop. The seat tracks have a 90 degree bracket at the front that attaches the front of the track to the face of a floor pan brace that runs from the tunnel to the sill. This prevents the fixed, lower part of the track from moving any further rearward. The rear of the track bolts to the floor and I really don;t want to change the factory floor pan mounting points. I'm wondering what prevents the upper portion of the track slide that bolts to the seat from moving further back. Maybe later big body models had longer seat tracks, I just don't know but there sure isn't quite enough leg room for me.

Has anyone modified their tracks or their seats to gain some backward travel and if so how ? I'm going to pull the front seat and have a closer look but I'd like to know if anyone has any experience doing this to their car. I don't need much, maybe an inch or so would make a big difference.   

Back when I got my Javelin in the mid 80's, I came across something about the seat extenders, and 2 inches of displacement. I never had an issue with the Javelin, so I never bothered to find anything else about it.

The previous reply is the first time I have heard someone else know of such a thing, from AMC.

I am in need of the same thing, my 66 Classic has me too close to the steering wheel - LOL! And like the OP, my issue is the front of the lower brackets bends down over the front of the seat pans, so you can't just make extensions, and move the seat back - unless you raise it about 1-1/2 inches, which is not good either, as I already hit the headliner. I was hoping, as the OP said, that later seats might have flat tracks, and somebody would know, who has dealt with this.

I have to keep the original seats as all the front upholstery material is new and the car is totally stock and in as close to new in condition as is possible. I'll need to pull the seat and tracks out together and see if there's some way to shift the seat rearward where it's bolted to the upper, moveable track. I was thinking that maybe on later model big bodies, like 68 and up with bucket seats, that the seat tracks may have been redesigned to have additional rearward travel. Maybe I would just need to find a set of later model seat tracks if that were the case.

Anyone here with with a newer Rebel or Ambassador with bucket seats have any issues with the front seat not going far enough back ?

billd wrote: I know one thing for sure about AMC seats - those 5/16-24 keps nuts are not something you find locally at any hardware store these days. Even not on Amazon - you have to find a bolt specialty place these days.

https://www.mcmaster.com/k-lock-hex-nuts