Pitster Pro XTR T4 250 LC?

[bikerdoc]

Can't help with compatibility to any seat from another make/model, but, have you thought about having the seat off the bike reshaped? Places like Sargent, Corbin, Mustang, Saddlemen etc. I remember reading about a motorcycle seat reshaper in Calgary but cannot recall the name.
Or perhaps by yourself an Airhawk... or maybe even a generic gel seat covering.... might work.

A search on Goog.le or Yah.oo using the search terms "motorcycle seats" will likely turn up something useful and likely close to your jurisdiction. You could look at making your own, if you get yourself some memory foam, a steam wand or regular steam iron (to stretch the vinyl to fit).