Even if they were required to have a 3rd stop light for 1994, some pick-up/SUV/vans did had them before that year. Here is the list that i remember, anyone who finds one that is not on the list is welcomed to add it

Ford Econoline-1992
Ford Explorer-1991
Toyota Previa-1992
Chrysler minivans-1991
Nissan Pathfinder-1993
Isuzu Rodeo-1993
Isuzu Trooper-1993
Ford Ranger-1993
Mercury Villager-1993
Nissan Quest-1993

Ford Bronco - 1992.

Mitsubishi Montero -1992

Nissan Axxess - 1990 per importarchive.com's listed brochures.

looks like the Land Rover Range Rover had a CHMSL as soon as 1989

https://bringatrailer.com/listing/1989-land-rover-range-rover/
https://www.carsforsale.com/used-car-dealer/rideway-preowned-auto-sales-charles-town-wv-d667315/inventory/details/70005699
https://www.luxsport.com/1990-land-rover-range-rover-county-c-602.htm
https://bringatrailer.com/listing/1991-land-rover-range-rover-15/

I won't list everything i found about pre-1994 ones having it but i think its just too much for being an owner add-on.. or they all had the same idea..

https://www.imcdb.org/vehicle.php?id=1311188
Thanks to karkidbut for finding this

Here in Australia the LandCruiser (J80) had it from late 1992 - I'm assuming US is the same. The J70 series LandCruiser also had from the same date but only on the RV trim (uncommon).

found some 1993 with it, 1992 without so i guess late 1992 means 1993 in US ( this gen was not sold in Canada , unless you wanted to pay 20,000 $ more for a Lexus.. )