This article is based on a stem extension with a "D" shaped profile. Widespread valves began using this stem extension prior to 2000. If you are unsure the above image is your version, see Two Handle 8" Wide Spread: Lever or Two Handle 8" Wide Spread: Knob for details.
This article explains how to correct your faucet handle if it is not rotating properly after installing 90274. Version 1 is single piece stem extension used in knob handles. Version 2 is a two piece stem extension used in lever handles.