As long as the loop ain't rusted through,

I don't see it impossible to diy a replacement strap.

It's just a strip of metal with a 90° bend at one end with a slight radius looking at the profile from the side. The width doesn't matter. It could just as well be 5-inches wide.
On the other hand the length should be shy vrs. too long as any gap can be filled in with washers. And even washers might be overkill, that is, as long as the bolt pulls the
opposing tabs tight enough in each other's direction, it's good enough. The opposing tabs don't have to flush up to each other in this application.

We arrive at the point where the value of form over function should be contemplated. You could just as well use tie wire since this part is hidden. Nobody would know the difference.
But your bike will. And every Valk rider that passes you on the highway will sense something's wrong with you. (Just trying to be humorous.)
