Renazco does not make a seat, but will mod it....I had a reservation in, then cancelled getting a Corbin instead.
I just bought a Sargent selling my Corbin....the seat is wider than the stock seat, so I hope it spreads the weight better. It also appears quite hard, which is not a bad thing as seats that are too soft cause problems. I have not had the chance to ride the bike, planning a 6 hour freeway tour to try out the seat. If that doesn't work, I'll send it back and get a Russell all day.
In ordering the Sargent, I was told the Tenere seat is very difficult to build well. My past 5 Corbins have all been excellent....not so on the ST.