I just mounted an 06 gsxr shock, only a touch longer than stock, had to grind the rocker a bit for clearance for the larger spring, also relocation of the stock overflow is necessary (mine already was), I may lengthen the dogbones a bit to tweek ride height, will report back when the bike is back together and on the road.
That's probably too old, but with the k6 gsxr 600 shock, did you have any clearance issues when it fully compressed?