3-1/4" x 3-1/4"; 1-1/16" Caps; Short, Narrow
3-5/8" x 3-1/4"; 1-1/8" Caps (Long Axis); Long, Wide
3-1/4" x 3.68"; 1-1/8" Caps (Long Axis); Sims Ltd. Modified Metric
3-1/4" x 3-1/4"; 1-1/16" Caps; Non-Greaseable; For Carbon Fiber Driveshafts
9" center to end