Heh Jeff. First post! Welcome. Yep, there are lots of companies selling memory foam pads for backs, seat cushions etc. And I would imagine that they are stiffer or have a higher IFD. I am pretty sure that the density of memory type foams is naturally high so they would also retain their shape and body well.
Great to hear about your new Unique. You choose wisely grass hopper! No, unfortuniatly I will not be at home coming. I would love to go. I think it might be interesting for every one to see how well the cars hold up after more than 18 years! But with DVSF, etc I am just BOOKED until later in the summer.
So Clay, you DO have Tempur made for a seat
Rick