The Teflon lip seal used on the DA-6 and some R4 compresors are available as a kit, part number 2724319. If the compressor has the new lip seal, then a lip seal kit should be used for replacement. This seal kit is also available under AC/Delco part number 15-2292.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.