I got mine from Beechwood Canvas, but they were pricey as I recall. My only 2 cents is to try to determine first what thickness exactly will you want. If they are too thick (especially the backs) a thicker guy may have trouble fitting behind the wheel and having good freedom of movement. I would think that most mfg. could make the backs thinner as a custom order, but I can't say for sure. Just throwing this out there as some of the guys complain about the tight quarters behind the wheel.