I thought I would start this thread out of curiosity to see what basic essential Subaru parts for maintenance/fixes/upgrades have halted you in the middle of a fix and caused you to have to scour the ends of the Earth, or at least Atlanta, to find them quickly. Case and point I had a leaky injector seal. No Subaru Dealer carries one or a set of them they are special order. No one I new had a spare one. None of the speed shops had them. NAPA had o-rings but they turned out to be just an ass hair off causing a big fuel leak. Luckily I had some good ones on my stock injectors that I had lying around.
6 sided 19mm socket proved difficult. Same with whatever socket was needed for the tranny oil drain plug (23mm?)