Andrew,
While the seat is out, you can stand on the lower side bolsters and widen them. I did this to mine and it worked quite well. Take your time and go in steps. If you widen the seat too much, it may be difficult to re-install.
There is a thread on this subject in the archives.
Good luck,
Dan
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Thanks Dan, I'll look up the achieves, and that was basically my low tech way of widening the seat.
I'm not into that unique whip show, but I would of liked to have seen that one.