wiper motor mounting question

Been a while since I took the windshield wiper motor off and I don't remember which way the steel bushing things go. It has one short side and one long side. At first I thought they mounted on engine compartment side of the wiper motor followed by a rubber spacer, then I figured out they mount between the wiper motor and the firewall(on the studs), but not sure which side (short or long)goes towards the firewall.
Thanks
Aaron