this may help..
what i found when i done the 1.6 into my 93 sierra, i used my original (93) 5 speed,clutch,flywheel.
ground down the starter till the bolts lined up and bolted the starter in (no starter spacer)..
worked fine.
however i had to pull the box out a few weeks later so i put a older sierra 5 speed & flywheel in
as it had been rebuilt. same starter with no spacer. and when i started it it took part of the teeth off the
flywheel
so i think the starter motor (spacer) depends on which clutch,flywheel your runin..