Hi level exhaust mount bracket dimensions.

Am possibly fitting a set of S type pipes to a '73 with a strengthened rear subframe. Any chance anyone can give me the dimensions or a picture with measurements of the standard dual muffler mount bracket. I will make a new support bracket but would like to know where the standard mufflers sit in relation to the bike. Aware of the cracking problems so may try and modify the mount system. I see NYC Norton did something on their bike muffler mounts. The two mufflers are a lot of weight hanging there.