Have you got a pic of the frame? I've an s-works enduro from around that time that originally had a brain arrangement and spent a while looking for info on alternative shocks. Research suggested a non-standard stroke/i2i but alternative options were possible. The link on mine could be flipped which helped with the options.
That's a later version to mine so I can't help with exact measurements. I read somewhere that you measure stroke by letting the air out then measuring the shaft from can base to end. If you let me know what that is, plus the i2i I have a number of rear shocks so could have one that fits.
8.5" shock with 2.5" stroke in specialized speak, or 215mm and 63mm in European.
I say that with absolute certainty but its not the case, I only remember those figures because I read a thread a few years back where a bloke was swearing at the design of his Enduro because he couldn't fit a shock with a reservoir in to the frame.