No pics as I'm busy getting ready for a 4 week trip through Europe, I removed the seat from it's subframe and cut the spring loaded catch off. Then re drilled the 4 seat mounting holes 41mm back. There is a flat plate welded to the subframe that restricts the movement that needs cutting off or just a piece out of the front of it.
This then allows the seat to slide all the way back until it touches the bulkhead. I then welded a small piece of 1" by 1/8 flat to the underside of the subframe inline with the holes that had the bolts in that the spring loaded latch hooked onto. The flat was bent upwards to follow the angle of the chassis and 1 hole in it to accept a bolt to lock the seat in place. Hope it all makes sense I must say that if you are tall this is a really good mod.