This is a Procomp Electronics CS130 Delco style alternator with the mounting ear straight up and down . You can choose between a 1-wire (needs only the output cable) or plug-in that will use a factory regulator harness. The voltage is adjustable between 13.5 and 18.5 volts. Great for 12V or 16V systems. 
These one wire alternators offer the highest stability available for modern electrical systems. Available in Delco CS and Denso style alternators, these units offer a number of features including:

Powerful, Reliable Internals
Short circuit protection and loss of ground protection in a sealed, vibration resistant housing

One Wire Operation
Easy to connect, turns on and off with the engine