gaskets are still pretty easy to find:
but for the most part they hardly ever go bad, they can be finicky sometimes to get back in place but unless theyve been left bone dry for a few years, odds are it'll be fine.
actually, its still pretty easy to find any cocker part these days, unless its a race frame or one of those things that were just made in very limited numbers.
and honestly, if you wanna get rid of the ego do it before it loses too much value when the next one comes out. you should easily be able to find yourself a nice cocker, along with a slightly older high end in case you just want some more modern handy, and still have money left over. i love how my rapper shoots, but its also fun playing around with a mech cocker occasionally too.