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: Regulator, Electronic
OEM(s): Delco
Voltage: 12
Set Point: 14.8
Polarity: Negative
Includes Brush Holder?: No
Activation: Ignition
Adjustable?: No
Circuit Type: B-Circuit
Includes Rectifier?: No
Includes Tolerance Ring?: No
Notes: 
Orange-Sense
White-Ignition/Lamp
Purple-AC
Wiring & Mounting Screws Included
Application: Delco 31SI Alternators
Weight: 0.32 lbs / 0.15 kg


Substitutes:
Powerline 88-401

References:
Delco 19020400, 19020401
Powerline 88-401