10/22 Rear Sight Dimensions

Brother in law called about his 10/22. I don't know how, but he lost the rear sight. I have an extensive junque drawer and may be able to help him out.

Question:

Is the rear sight dimension a standard 3/8" dovetail or something unique to the Ruger?

Yes ,3/8"dovetail Marbles folding rear or an exact copy.

Thank you.