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Unless you have a good reason to add spring brakes or in your case, to replace the hand brake handle with a spring can, I would think twice about it. It's nice to be able to move the truck after you start it without having to wait for the air to build enough to release spring brakes.
You should be able to get the studs from any big truck service center. I broke one on my m915 and took what was left and got a new one. Just tell them the length you need.