97-04 GM Truck / SUV Mount. Tahoe, Blazer, Suburban, Yukon, Silverado, etc.
This is the most common unit used for brackets as well for multiple alternator systems. 4.3L, 4.8L, 5.3L, 6.0L, 6.2L
Same Vehicles also fit 05-13, and 14+. There are options to click your year range in the drop menu.
Color options are available as well.
390a units for GM vehicles have around 190a at idle, and 400+a of peak output potential around 1800-1900 engine rpm.
These units also fit older 91-96 applications with a AD244 swap, you can find information on how to accomplish this swap on youtube, and google.