According to Toyota's EPC (Electronic Parts Catalog) Toyota made a total of 2 throttle bodies for the van. The exact same part number is called out for every van manufactured from 08/1983-07/1988 & that is Toyota part #22210-73031. The other throttle body is part #22210-73022 and was used on the 1989 model year only (08/1988 to the end of van production 12/1989). I'm not sure what the difference is/was as I have interchanged freely between all years without noticing any differences. I study things very closely when swapping out, so I can't imagine missing something like a vacuum nozzle pointing the wrong direction, but I suppose it's possible. My 89 van is running with an 87 TB on it now and all the vacuum lines were fine using the same length as before and no funky bends going on. Tim