We used to have 5.0l VS executives when I started in 1997 Before they went to SS’s, the reason being that the resale made them more viable (when they were owned and not leased).
In the VR & VS days you used to see all sorts of wierd stuff at auction ... for at least a few years, ex-patrol cars at Pickles were all Exec interiors but re-upholstered in SS material (ie. the seats had Exec spec bolstering, radio was Exec, etc - an SS was higher in the range than it was in the VF era). I always thought it was a bit odd, as I'll bet the cost of modifying the production run to do those police specials probably cost no less than just producing SS's, but I suppose they were giving such massive discounts there needed to be the appearance of cost-cutting.
Poking around in the engine-bay you'd also see non-standard stuff like bigger throttle-bodies, non-standard air-intakes & air-boxes ... but that was completely inconsistent, if there were a dozen ex-patrol cars up for sale they were all different (except for the SS-trimmed Exec interior & the all same screw-holes in the interior trim).