[SS Tim]

The Highlander Plaid trim option and the Highlander package trucks are not uncommon. It was offered on Fleetside pickups, Blazers and Suburbans. In fact I've seen many that have been modified and the SPID is really the only tie to originality left.
It was however a one year only optional upgrade of the Custom Deluxe trim. GM has no known breakouts of unit production by trim level for the trucks at that time. So it is impossible to say a truck is x of xxx built.

Probably the easiset thing to do is read through my blurb that I have generated and refined. If you still have questions fire away.

Highlander Plaid trim was a trim only option based on Z62 Custom Deluxe or Z84 CST (Blazer only) optioned vehicles.

Highlander Promo Package trucks were also offered that bundled options with the Higlander Plaid trim. These were sales packages A,B and C with increasing levels of content.

Thus a promo package truck was a Highlander but a Highlander was NOT ALWAYS a promo package equipped truck.

Highlander Plaid trim codes
All include black dash pad, steering column (with or without tilt) and carpet. In addition the door panels, visors, console (Blazer only) and seat belts were always parchment (white). Seat vinyl was also parchment and the insert color is determined by the specific code. So the only variable color keyed component was the insert color of the seatcovers.
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Pickups Custom Deluxe Z62 mandatory option
Green 613
Blue 611
Gray 604
Orange 618
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Suburbans Custom Deluxe Z62 mandatory option
Green 647
Blue 642
Gray 639
Orange 651
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Blazer CST Z84 mandatory option
Green 680
Blue 677
Gray 671
Orange 686
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Promo package codes

A= YG6 Plaid Trim, Special Wheelcovers C10 (PA1) or Chrome Hubcaps C20-30 (PO3), Chrome Front Bumper, Upper (Belt) Molding, Door Edge Guards and Below Eye-Line Mirrors. A $94.50 savings.

B= YG7 (includes A) Adds Turbo-Hydramatic Trans., Power Steering and Tilt. A $178.50 savings.

C= YG8 (includes A and B) Adds A/C and Tint. A $260.50 savings.