engineering number C5OE-8509-A. Ford part #C5AZ-8509-J.  According to Mustangtek this pulley is correct for the following cars:

 

C5OE-8509-A

1965 289 Ford Full size PS or 42·45amp (exc/AC)

1965 289 Fairlane & Meteor PS or 38amp

1965 289 Mustang units w/alt-exc/AC XC

1965 289 Falcon & Comet ( exc/AC or XC)

1966 289 Ford Full size Std. or PS(exc/AC) wo/TE

1966 289 Fairlane & Comet Std. (PS-factory,dir -exc/55amp) wo/TE

1966 289 Mustang Std. (PS exc/AC) wo/TE

1966 289 Falcon Std. (PS exc/AC) wo/TE

1967 289 Ford Full size Std. or PS (exc/53·55·60amp or AC) wo/TE

1967 289 Fairlane & Comet Std. PS, Integral/AC wo/TE

1967 289 Mustang & Cougar Std., PS(exc/AC) wo/TE

1967 289 Falcon Std, (PS exc/AC), wo/TE

1969 390 GT Fairlane/Torino Comet/Montego std.&XC before_6-jan-69

1969 390 GT Mustang & Cougar std.&XC before_17-feb-69