Clutch pedal assist spring assembly [E1TZ-7534-A] - NOS

https://www.ebay.com/itm/224891944068?hash=item345c9abc84:g:lDoAAOSwW2xiM5Ev

From the MPC:

This is correct for an 81-82 with the 255 V8, 300, or 302 (Mechanical Clutch)

or

1984+ F250 or F350 with the 6.9 or 7.5 (Hydraulic Clutch) and T19.