In '95 I bought a new Honda "ACE" 1100cc and after appropriate brake-in, drove a 150 mile round-trip and had serious butt burn from the stock seat. Serious in the sense it took about a full week to go away.
So I ordered a Mustang seat, with pylon and both back supports.
Shortly after installation (maybe 2 weeks?) I drove 480 miles in one day and had absolutely no problems. And my back was 57 years old then.
But after a recent call I made Mustang still does not have an off-the-shelf seat for our Triumph Americas because if they did, my bike would have them on now.
Good Luck!