It is a TWO groove V-Belt PRESS FIT design (Not for Keyway Design).
Chrome Power Steering Pump Pulley KeyWay 1 Groove For SBC BBC GM Chevy 350 454
Pulley CHROME Power Steering Pump V Belt Double Groove Saginaw GM Chevy PRESS ON
SBC SB Chevy 350 Pulley & Bracket Kit w/ Chrome Power Steering Pump & Alternator
SBC Small Block Chevy 350 Pulley & Bracket Kit w/ Chrome Power Steering Pump
For SBC Chevy Chrome Long Water Pump Power Steering Pump &Chrome Alternator 130W
Tuff-Stuff 8488A, One Chrome Aluminum Power Steering Pump Pulley Chrome Performa