Frame cradle to body insulators will not be identified by colour code in the 1987 Oldsmobile Chassis Service Manual.
Parts Department does identify the part numbers of insulators by position in Group 9.000.
As a result of engineering changes since the service manual was printed, insulator colour codes listed in the 1986 Oldsmobile Chassis Service Manual may not be accurate and should not be used to determine if the correct insulator was installed.
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.