Did you order your GC's and KYB's seperate?
I ordered both from GC and the adjustable collars were already installed on the struts. So I probably can't help you if that is the problem.
Like Kevin said make sure to remove the dust cap and bump stops and put them on the KYBs. Also you will want to cut the bump stops in half to get any decent amount of suspension travel.
Any more Q's just ask.
Aaron