Here it is KW
http://67-72chevytrucks.com/vboard/s...=794677&page=5
I thought you were referring to the front..
If the shock is installed on drivers side, measure the installed shock length from bolt center to bolt center..
Then measure how far from top or bottom of frame rail to frameside stud..
Transfer this measurement to pass frame rail in the general area of your patch
Then measure the pass side from axle end shock mount to the frame repair area using the installed shock measurement
You should be able to visualize where the hole needs to be where all these lines intersect..
It wont matter if your measurement is off a little