I have been shopping for seats myself, new and used.
The LSR is new to me, I have been driving (and a bit of racing) off road for many years and used the beard suspension seats. Looking at Butler and Kirkey. I am starting off slow (130 club at WOS) and go up from there.
I am also thinking the same what stainless stated, but for now I only have a 3 layer fire suite. So a bit more padding might be nice to the backside on a aluminum seat. I was thinking cotton layers would work for padding.
Mike