"I wonder if the wide angle eyepiece will fit the older style."
I emailed Swaro a couple months ago asking that very question. According to Swaro the new eyepieces will fit the ST / AT scopes. Unfortunately the eyepieces won't "lock in." Probably not an issue with the fixed powers but when twisting on a variable ...... who knows when it'd come loose and drop to the ground.
Azbow, why not try eyepiece off the 65mm scope on the older 80mm scope? Give us an update if you do. The newer eyepieces have a bigger field ..... I think.