Massey Ferguson®
Fits 10"/12" Dual Clutch Tractor - 365

Fits 10"/12" Dual Clutch Tractors with 21 Spline Disc - 271, 281, 290UK, 360, 362, 375, 383, 390

Fits 10"/12" Dual Clutch Tractors with 21 Spline Transmission Disc - 275UK (ASN B34001)

Fits 12" Single Clutch Tractors - 365, 375

Fits 12" Single Split-Torque Clutch Tractors - 275UK, 360, 390

Fits 12" Single Split-Torque Clutch Tractor with 21 Spline Disc - 362 (Engine BSN B11042)

Fits 12 1/4" Single Clutch Tractors - 285S, 4225, 4233, 4235, 4240

Fits 12 1/4" Single Split-Torque Clutch Tractors - 275UK, 383, 390

1 1/8", 21 Spline - RCB-5*

*Definition:
RIGID
This term refers specifically to the drive plate that is attached directly to the solid steel plate. Opposite of dampened.
CUSHIONED
The clutch lining/steel plate will have some type of link to absorb the shock load. Most commonly you will see extra rivets and links between the ID of the facings and the OD on the drive plate. Not one solid steel plate.
BUTTON
The most aggressive clutch material is the bronze, metallic button. It offers extended life using reduced static pressures and a quick, clean engagement.