Brand X 390 Amp Large Case GM Alternator
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
This is the internally regulated option for the 14.8v set point.
390 amp units for GM vehicles have around 190 amps at idle, and 390 amps 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.