Gottlieb rubber part numbers and sizes
Gottlieb manuals give rubber part numbers without sizes. A-10217 to A-10226 are rings of 3/8", 3/4", 1", 1-1/2", 2", 2-1/2", 3", 3-1/2", 4" and 5". A-17493 is a 7/16" ring. A-14793 (23/64") and A-15705 (27/64") are mini-post rings. A-13149 is the red flat beaded ring for the 2" small flipper and A-13151 the red 3" flipper ring. E-15 is a rubber tip, 1872 the plunger tip, A-1344 a rebound rubber, 986 the drop target grommet, 2752 a chime grommet and A-5240 a grommet.
Systems
Related tips
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)