Any 60's rock-ola jukebox experts?

[dr galaga]

At the Chicagoland Show I came across a few decent wallboxes for my Rock-Ola 440.  Today I was looking at them and something seemed different.  I removed the coin box and noticed that they are 504's  '> (80 selections instead of 160 selections).  
How much would I have to swap out of one of my other donor boxes to make these function as 160 selection?  Are the "pulsing" units different or just the page assemblies? '>
Good thing I didn't let him give me a good deal on all 6 that he had!