Chapter: 3600
Section: 3626.6
(Renumbered from 3623 5/72)
Spark plugs will be ordered by model number if known, or the make, year, and model number of the equipment requiring the spark plugs. Emergency purchases of complete sets will be authorized only if request for payment is on an automotive repair shop (not a service station ...
https://www.dgs.ca.gov/Resources/SAM/TOC/3600/3626-6