according to CIP1.com, the manual accelerator cable is the same for
all years 83-92
http://tinyurl.com/rmvtp

also, GoWesty says the same thing (actually they say 83-91 which is
more correct in NA)
http://tinyurl.com/oq7ev

Perhaps phone/email BusDepot to see why their cable is only listed for 83-85?

>Does anyone have an alternate source?  Why does it matter manual vs
>auto for an accelerator cable?

Auto transmission has a metal "kick-down" linkage that doesn't exist
with m/t vans.  The a/t accelerator cable is much shorter since it
connects to the transmission first, not the throttle body like the
m/t cable.