All the info you need
to find a replacement capacitor should be printed on the side of the
capacitor you're replacing. You can also check in the opener manual for
your garage door opener there should be a parts list (usually near the
back of the manual) that should show what capacitor to use. If you don't
have a manual you can view or download manuals of different makes and
models of garage door openers on our Support Manuals site.