G.M. Compressor Hose Adapter 90 Degrees Out With Washers. This adapter works with GM HT6 and GM HU6 Compressors in the following year ranges:

HT6: 1996-1998
HU6: 1999-2002
For Early LS applications, the Hi side has step. Look at pictures.

The adapter is designed to use a # 8 13/32″ A/C fitting and a # 10 1/2″ A/C fitting. The thread sizes are 3/4″-16 and 7/8″-14, and both fittings use O-ring connection at the hoses.

Adapter center to center measurement is ~1-7/8″