Shackle lenght eye to eye

I am trying to level out my lift in the rear because it only has about 3" as compared to the 4.5" lift in the front and I'm not sure if it already has lift shackles or not (it looks like it does). Can someone go measure the length of their shackle from eye to eye and let me know the length and if its a stock shackle or if its a lift shackle (with how much lift its susposed to give).
TIA

A stock shackle is 3" c to c.You get about 1/2"of lift per 1" of additional length!

Thanks for the help.