Early A: Have plans/diagram/photos of Rear Shock Extension?

The one full leaf I added to both sides of the rear suspension of the '65 Formula S may have lifted the rear more than a couple of inches (it looks almost as if the stock-style shocks are fully extended at rest). I was thinking about a two-inch or so rear shock extension of some kind. Need an idea of how to fabricate such puppies if I go forward with the plan. Thank you.

shock ruler copy.JPG