Minneapolis Washer manufacturers a variety of rectangle and unusual shaped washers.
OD 0.6250 / .315 RECT.
OD 0.8000 * .500 RECT.
OD 0.8120 * .750 RECTANGLE
OD 0.08170 + – .010 * .500 + – .019
OD 1.0000 * .800 RECT.