Search:

not sure if you've sorted this as I'm a bit late with my reply - but I'm 6'8" and 200kg - I've been trying to adjust mine for ages and can't seem to get anywhere - just around in circles

Have you had a look to see if there are spare adjustment holes on the rails or seat base themselves.?
I remember seeing a few holes when fitting my seats,

Welcome mate, surely the best forum on the net. If you need it, you can get it, if you want to know it, just ask it.
If you want to find it, go to the search bar for a universe of information. ...

Welcome to the forum mate

welcome to the forum, enjoy your stay

welcome to the forum mate, i think the best way would be to get new a seat base made up but that will involve engineering.

Cant you remount the seat back on a frame of there own, never heard of the sliders having an extension.
You might want to talk to a fabricator doesn't seem like a hard job IMO.
Is it possible to...

Welcome to the forum mate. Don't know about making the seats go back further, I never had the need. Should be possible though by repositioning the mounting points I would think.

G'day mate welcome aboard

Welcome to the forum mate, feel free to ask any questions.