Okla. Admin. Code § 45:40-3-5
It is hereby provided that all vehicles owned or leased and made use of by Wine and Spirits Wholesalers, except licensed Carriers under the Oklahoma Alcoholic Beverage Control Act, to transport into this State from a Nonresident Seller to the Wine and Spirits Wholesaler's warehouse or to all Retail Spirits, Retail Wine, Mixed Beverage, Caterer or Special Event licensees shall have displayed on the outside of the doors, windows or side panels on both sides of the vehicle, a sign in letters at least three (3) inches in height and one and one-half (1 1/2) inches in width, giving the name of the Wine and Spirits Wholesaler, address, and his Alcoholic Beverage Laws Enforcement Commission license number. This provision shall also apply to all noncommercial vehicles owned or leased by any Wine and Spirits Wholesaler in which vehicle any alcoholic beverages may be transported at any time. The above stated dimensions shall apply only to the letters A.B.L.E. and license number. The name and address of the Wine and Spirits Wholesaler may be printed in letters of lesser dimensions.
Okla. Admin. Code § 45:40-3-5