Pi head missing parts swap

[Dthomasv]

Hey guys ive got a 97 gt and im kinda new to the ford scene, ive got a good deal on some pi heads but theyve got a few missing lifters and rockers. Would i be able to intechange those specific parts out of my non pi heads or is it a completely different design?

 

[trombonedemon]

Lifter | AutoZone.com
Lifter | AutoZone.com
Seems like they are according to the autozone serial numbers.