15592270 85-86 Truck
General Motors Part Number 15592270 Clutch Release Fork
0.795 FORK, Engine Clutch Release
85-86 CK 1,2,3 (Chevy Truck Parts Book)
87-91 RV 1,2,3 (Chevy Truck Parts Book)
Factory correct applications are your responsibility. GM made part and part # changes with no rhyme but a reason (no production interruptions at any cost).
Application charts are for replacement parts that were available at the time of parts book printing, and when possible model specific assembly manuals.
My observations come from the parts I have in my collection or other reliable sources your parts may differ.
If Factory correctness is your goal, do more research, join car clubs,
forums and buy an assembly manual if one is available for your Project Car (you wont be sorry).
This is a fun and interesting part of the hobby!