I’m looking for a replacement mount for a cheap BSA red dot

Quite a while back I bought my son a cheap springer and put a BSA red dot scope on it. It turns out that particular rifle was absolute trash (it was a Beeman which I usually like but the cheapest Beeman money can buy).

He now wants to put the BSA red dot on his 2250 but we have long lost the mount. Does anybody know where to get a new mount? Hopefully cheap?

The bottom of the BSA has a rail that looks kind of like a weaver rail (kind of). The mount just basically clamps the airgun rail and the BSA rail together.

ANY TIPS are greatly appreciated!

Thanks,
–Dan