I am not sure if this seat would work on your 82 FXRS but you talk about a comfortable seat....look at the "stock" seat for a 1999 FXR3. I have it on my 1999 FXR2 and it's wonderful....best seat for the FXR in my opinion, I am just not sure whether you have to have a seat that is "hinged" or not.....if you don't I would certainly look at one of these seats...
click and view:
http://www.cvoharley.com/smf/index.php?topic=22663.0
Regards,
"Classic"