Rear coil over before and after...

Ok. Im installing my rear grantelli motor sports coil over kit on my 90 mustang and Im using kyb agx gas adjustable shocks. I cut the dusk shroud off and I went to slip the adjustable screw pirch the spring sits on and it wont slid over the bottom of the shock? It does sit all the way down on the shock, right? I need help! Maybe the kyb shocks arent compatible with the coil over kit? Maybe I should just get koni? What are you using?
 
For those of you concerned about rear tower strength, I've seen rear strut tower braces for foxes on Ebay. I'm planning on getting one for my GT vert. They're pretty cheap, about 80.00.
 
I ended up going with koni shocks and it worked out great. The rear looks so nice now! Can't wait to see how the ride is. Still have a few more weeks before I can take it out though.