Also, if it is a GS. I use a cinder block to set the final drive on to hold it and then it makes it a straight shot to get the bolts on.
Also, it you to torque the bolts this helps. I have one but wish the arm was a bit longer so the head of the torque wrench would clear easier.
I also use blue lock tight as I've had them come loose before. You have to get ALL the oil off the bolts and out of the holes tho.