hi,
someone had posted this on google pinball group about back glass dimension

WPC games - Bally williams games from the 90's etc
27 X 19

System 11 Games - same size as WPC
27 X 19

Bally - early solid state - Paragon, Supersomic, Eight Ball etc
28 1/2 X 25 3/4

Stern - Early solid state Nugent, Seawitch, Trident etc
same as early Bally's

Early Williams - Gorgar, Flash, Firepower etc
28 1/2 X 25 1/2

Data East - Starwars, LAH, LW3, etc
26 X 22 1/2

Bally system from 80's? Elvira, game show, dr dude, party zone etc,
translites that cover DMD ?
27 X 23 1/2

Willliams system 80's Kings of Steel
25 3/4 X 28 1/2

Stern - New
26 X 19.1/4

does anyone know what are the dimensions for Gottlieb EM and Gottlieb Sys80 back glasses?

thanks