Just on the internet chasing some other stuff down and looked at
[admin edit - URL removed - it's dead / taken over by a junk site]
Not only do they have the nice swing away bearing hinge parts, but they also have a nice assortment of VERY CHEAP builder parts and tabs for all sorts of applications.
Don't remember who was looking for the swing away tire bearing/hinge/pin, but it's here. Rock Logic has it for $45 which is pretty cheap considering what you get.