- Fits Fruehauf 16-1/2" trailer brakes
- Splined Area: 1-5/8" - 37 Spline
- Bearing Surfaces: 1-5/8"
- Under Head to Snap Ring Groove: 21-1/8"
- Under Head to Bearing Surface Groove: 2-5/32"
- Cam Head Thickness: 1-3/8"
- Cross References: M-566-R, M566R, E2100, E2100RH
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