I ordered this starter from work brand new. as you can see i have a 2.0 blacktop with a 1.8 silvertop flywheel. This starter fits a 2.0 sierra with a pinto, because its brand new part with gear reduction design (rather than a rebuilt lucas) It fits a treat. The original starter this replaces would have had a larger diameter motor and fouled the sump.
I would ask your local auto electrician rather than your motor factor as they can look up the exact measurements, mounting hole locations and throw etc