LX280 Tightener Spring

I have a 2005 LX280 with the 48" mower deck. Where does this spring attach to on the lawn tractor itself? I know where the spring attaches to the deck (the rear center of the deck at the end of the lever for the deck belt tightener spring). There is a green "arm" on the drivers side (just left of center line of the lawn tractor) with a hole at the end of it and that is the only place that is within the reach of the spring. I just want to make sure it is the correct spot.
This is the spring i am referring to - John Deere Tightener Spring - M138251