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Good luck. Those are pretty much just pot metal and I haven't seen any old ones that aren't already broken or just completely worn out. Someone may have one used but they are hard to find.
You can buy them new though (aftermarket) through LMC Truck. The complete kit without the lock cylinder is about $40. If you need a lock cylinder too it's another $20. I'll need to pick up one of these soon as well for my '76.