These brackets allow you to relocate your alternator 1" higher and 1" towards the firewall on your 3800. They only work on the 99 and newer style alternator brackets. These are required for M112 hybrid installs or for installing an intercooler in 2004 or newer GP with the L32 engine and Gen 5 supercharger.
Picture below shows how close the alternator post is to the blower after installing an intercooler on a 2004 GP. Rather than downgrade your 125 amp '04/'05 alternator to an older unit, ZZP has developed a real solution.
Longer accessory belt required when moving the alternator.