I'm pretty certain that all GL1500 seats were the same, except for color variations, and some that did or did not come with the seat cover built in under the backrest (actually, part of the seat). Maybe someone who has actually swapped them can reconfirm this, but that is my understanding. I have a '97 seat for sale, if you're looking.
These are the times that try men's souls. The summer soldier and the sunshine patriot will, in this crisis, shrink from the service of their country; but he that stands by it now, deserves the love and thanks of man and woman. Tyranny, like hell, is not easily conquered; yet we have this consolation with us, that the harder the conflict, the more glorious the triumph.
Thomas Paine December, 1776