New old stock part.  Listing is for a single part.  If more than one is pictured it is just to show difference in packaging or condition.  See photos for detail and condition.

Description: Rectifier
OEM(s): Denso, John Deere
Number of Diodes: 6
Diode Amps: 30
Stud Size: M5-0.8
Rectifier Polarity: Complete Assembly
Unit Polarity: Negative
Mounting: Rectifier OD
Mounting Distance: 4.331in / 110mm
Diode Type: Button
Includes Brush Holder?: Yes
Includes Capacitor?: No
Includes Trio?: No
Application: Denso Alternators
Weight: 0.64 lbs / 0.29 kg

Substitutes:
Denso 021600-1381

References:
Arrowhead AND1206
Denso 021600-1380, 021600-1381