Ken - you're doing a great job of investigating your car's provenance. To say it's had an interesting past is certainly an understatement!
From the information we have, the run of '89 SMPVs were not equipped like nor put into prior service as regular B&W patrol units as the '85 examples had been. The '89s were dedicated special units from the start and were received from Ford just as every other Mustang was - painted B&W and with no equipment installed. Prior to being run down the Motor Transport assembly line for upfitting, they were sent out to be repainted in various colors.
When they returned from the outside body shop, they were specially equipped with the Stico undercover antenna, unique decklights, mirror light, shotgun/radio rack and the mag mount spotlight. They carried all the normal items (radio cabinets/ siren amp mounted on an equipment board, wooden supply box, etc.) in the trunk as any other Mustang.
What didn't go on the '89 SMPVs, at least initially, was the normal low-band whip and rooftop repeater antennae, dual 6" spotlights, shotgun/radio rack or trunk lettering. But it should be noted that it's always possible that some of these deleted items may have been added at some point to certain cars after they were deployed in the field.
The Stico antenna was used with the Motorola radio and the scanner, but not sure about it's use with a CB. CB's were purchased and installed locally by the field offices and from photos of regular units and evidence on my car, the anntennas used were mag mounts and were usually placed on the forward middle edge of the rear deck lid. Don't know if the field techs would have/could have tapped into the Stico or just gone the same route as the regular units. Either seems possible to me but maybe one of the radio techies here can chaime in.
I've been long searching for but have never found any interior shots of an '89 SMPV, save for that one I posted of the Caprice. Unless or until some kind of hard documentation surfaces, you may just have to interpolate what the Mustang rack may have been using that Caprice photo, the existing mounting holes in your car, the types of materials and construction used on other CHP racks and the determination of what would have worked.
As far as we know, the exact build number/ID #'s for the SMPVs has not been documented to date. But I suspect that the number produced, esp. for the early multi-colored versions, is very, very low. They were not spotted very frequently and many keen CHP observers, myself included, never saw one when they were in service.
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