I ordered some stuff from Brent last year and he mistakenly sent me the low profile seat. I thought it was more than 375 but that is not a bad price if you are right. I think those HD seats you are looking at are probably covered with vinyl. Since doing my solo seat, Chris has come up with a much better idea for our seats. We have found some quality neoprene that is much softer than what we used on my seat. You would be surprised how affordable it can be.