I have both deluxe and std brackets (NOS) and it is hard to do this with dimensions only. They have different curvatures. Tomorrow I will try to get them out and take some pictures. The std outers have an abrupt angle where they head out to the end bolt where the deluxe ones it's more of a curve. The inner ones that look like a question mark, the deluxe ones have a longer straight "tail" and a tighter half circle part, if that makes any sense. Seeing them together is the best thing and I will try to get that set up. Maybe Kube has a better way to tell. It was a long time before I could identify one from the other like at a swap meet or loose off the car.
I have 2 deluxe 40s and 1 V8 (std) and have been collecting parts for a long time.