How to determine replacement shocks

[JarheadWill]

Hi all, to start this out I just purchased this 75 CJ5 and going through it now. She is in dire need of new shocks however I am sure she has a lift to her to fit the 35s. Looking for any help in determining how much of a lift she has so i dont buy the wrong parts.

Currently has 35x12.5x15s

 

[jfmcj7]

Take the existing shocks out and compress then and measure that, then extent them and measure that length. Then buy new ones that are the same.