In good news: I've discovered that one of the parts for my van that I can't find (The aux air valve) is actually a very slight variation on a fairly common Bosch part from the era, so maybe I can get my van back together without spending too much.

I think I'll need to get one of the ones from a Nissan and just take the part (hose nipple/faceplate) from it that is necessary to repair mine, since there is enough of a difference that I'd worry about it not matching closely enough as a whole unit.

#ToyotaVan