You can use 22000uF/80V (more common value). You can find it in digikey.com Example here:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=E32D800HPC223MD80M-ND
Another good source is mouser.com
example here: http://mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Screw-Terminal/_/N-75hqz/
I'm not sure if you want chassis mount with one large nut or one that has two screws (digikey example). Check catalog picture before you buy.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=E32D800HPC223MD80M-ND
Another good source is mouser.com
example here: http://mouser.com/Passive-Components/Capacitors/Aluminum-Electrolytic-Capacitors/Aluminum-Electrolytic-Capacitors-Screw-Terminal/_/N-75hqz/
I'm not sure if you want chassis mount with one large nut or one that has two screws (digikey example). Check catalog picture before you buy.