2000 Specialized Enduro Sport Shock Info

Hey guys, I have the 2000 Enduro Sport, I bought it new years ago, but now it is just sitting in the garage doing nothing so i thought i would try to breath some new life back into it and make it a back-up bike for when my main bike is out of service.

It came with the coil vanilla shock and i am wanting to upgrade to an air shock, does anyone happen to know the eye-to-eye measurement and stroke length that i would need for this bike? I called Specialized, but they said they don't keep records on their bikes that far back.

here is a pic of the bike (not the actual one) i have...sorry the pic is so small, it was the only one i could find on the internet.