Conversion Kit

A game sold not as a complete machine but as a kit of parts — playfield, backglass, ROMs, and documentation — designed to be installed into the cabinet of an existing machine on the same platform. Conversion kits allowed operators to refresh their game lineups without purchasing entirely new cabinets, and they allowed manufacturers to sell new titles at a lower price point. The practice was common during the WPC and early Stern eras, where a stable cabinet and electronics platform could host multiple different games over its service life.