rear struts - 98 gtp

I have a 98 GTP, 2 door. im replacing all the struts in the car and i've done the front ones before. the rear ones i notice have something else attached to them - if i had to guess i'd say it was the sway bar??? either way, it's connected to the strut with a bolt that has a center bolt in it - a hex head. i'm not sure how to disconnect one of these bolts, can anyone tell me how to remove these without breaking it???

don't want to go any further without knowing. thanks.

nevermind - that was a stupid question. I didn't realize there was nut on the other side that needed to be held while loosened. struts are easy to remove on this car (with wd-40).

thanks anyway!