ok I feel a little foolish. I may not have ordered the correct part. the long length( bolt holes) is correct at 5 1/4", the two bolt holes at bottom are 1 1/8th a part, but the arm is 2 1/2 long center of pin to center of threaded hole.
If you have the correct one it would be great. I did not know that you had more than the one part number. From the inside of the old one were these numbers.....RD 1963 CAN....R H ...........THANKS FRANK