i think you can get the current ones regassed.
someone had a list of ones from other cars which do fit but i forget where i saw it. it was on toymods somewhere
Go to a wreckers and get struts for a AE80/AE82 Corolla - they're cheap and they fit, although the hatch will not open up quite as high as before (not a problem in practice).
This is the thread from this forum where this was discussed: