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You would have to make it yourself (or get a shoemaker to do it for you)
They are fairly easy to make, the plastic lock will be available on outdoors stores, they come on different sizes.
All of it you can also get from ebay.
It looks like the bits are held together by the metal crush pin between your fingers. so I would say is a 3/10 difficulty level
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Basically what you will need are 2 leather belts cut to the length you need the straps. Then attached the plastic buckle on the other end.
This way the metal buckle is already fitted and you only worry about the plastic bit which should be easy to fit.
Even better if you have a shoe repair shop and ask them to fit the plastic buckle.