704 series rochester, power piston length

[R72K5]

i need to find if a 704 series(1972 year) series quadrajet carb would use the longer or shorter power piston assembly


here is longer one in RH bottom corner of page:

or who i can ask who would know

ive got a carb that has this part removed from inside and i dont know which one is right for it


thanks

 

[rhuarc31]

Pretty sure it's the longer one.