Adding OEM Keyless Entry, to a 1992 Olds 88

Hello, I bought a GM keyless entry module with matching remotes on eBay. Does anyone know where I might locate the factory harness plug for the module? Or, is it even possible to add the module to a car that did not have factory keyless entry? From what I researched, this module should work with most all GM's that had factory power locks, which mine has. But, I cannot locate the harness plug. Thanks.

I found the installation location for the RAC near the PCM, but, I cannot locate the harness plug for it. This car definately has the provisions for this, I've located the section in the service manual for it, and found the installation location. Any ideas on where the plug may be tucked away? I can't imagine GM having a different wiring harness for a car without remote locks. Thanks