Hi,
These are pictures of the Roller Assembly I am looking for. I believe it to be a match for your part # 81-020.
My measurements, with digital calipers, are; .850'' across the flair, 1.550'' Height, .750'' width, 1.465'' roller dia.and 2.010'' length. I realize these dimensions are probably more precise than they need to be, and with a ruler, they appear to be the same as your part # 81-020.
Thank you for your assistance.
Ed