The corner is 3/8 x 3/8 and the stop is 1/2 high 3/8 x 3/8 wide
Thanks.
Paul from SWISCO responded:
June 9, 2017
I'm afraid I've been unable to find an exact match for this corner. Our 95-243 might work by drilling a hole and adding a screw like 33-089 in the corner to make a stop. Would that work for you?