A spinal implant insertion tool, comprising: a) a shaft having distal end having upper and lower pairs of prongs extending therefrom, the prongs adapted for holding an implant or an implant trial and defining a centerline therebetween, and b) an adjustable stop slidably received upon the shaft of the tool, wherein the adjustable stop has a bifurcated distal end defining first and second prongs that are off-centerline from the centerline. Because the stop is bifurcated and thereby avoids the centerline of the vertebral bodies, it will not collide with components of a Caspar distractor.