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This should be the part number for your wagon, I couldn't find a difference between 2wd/4wd or auto/manual. Part# 15650-PE0-004
It falls under Engine>breather chamber on the OEM honda websites. It is also discontinued/out of stock on most sites, but I did find a seller on Amazon selling one new.
Unfortunately that seems to be the case in my area as well. Have called junkyards in 4 surrounding states with no luck. I guess I'm just going to have to make my own!