Rear Alignment Part 2

Had a final check of the alignment and took a couple more photos to clarify the method, here is the laser level which shines forward onto the steel rule at the front end of the car -

Just shimming the upper forward mount (the one with the temporary brass bolt through in the picture below) then fill in the spaces for the other 3 mounts as required. The laser points forward with a vertical line so I can take a measurement as below:

 

you might just be able to see a faint red line at 450mm, its a bit obscured by the camera flash.