Pop bumper (jet bumper, thumper bumper) ring and rod assembly is used by all manufacturers and is interchangeable with the following part numbers:
Atari A004730-01 ring and shaft
Bally A-1873
Brunswick / Briarwood 55-101014-000
Capcom A-00374
Coffee-Mat 19509
Chicago Coin Machine 231-1507 rods + 312-504 ring
Data East / Sega / Stern #515-5085-00 / #535-5825-00
Gottlieb A-16634 rod and ring
Playmatic AC-2
Williams A-4754