Not the ideal solution, but years ago when very skint I stick welded the master leaf on a Marina pickup.
It was a pain to do and I took great care to set a good wide 'V' on both sides and laid all but the capping runs with dissimilar rods and capped with standard mild steel rods , then ground everything back down the the thickness of the leaf. Any sign of undercut was then filled with mild steel rods and ground back smooth again. A light smeer of greese put both leaves back together and you couldn't even tell it had been welded.
I have to be honest I was very surprised that the welded spring was still in one piece when I finally got rid of the car about 8 months later.
As I said not ideal, but it's an option.
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