CALIFORNIA WARNING: This product can expose you to chemicals, including lead and DEHP, which are known to the State of California to cause cancer and birth defects, or other reproductive harm. For more information, go to https://www.p65warnings.ca.gov.
3D printed guide/spacer used on drop target assemblies in Williams games from 1970's & up, and Bally/Williams games after 1987.
Reference:
3B-7479 guide
03-7479 guide
D-9612 drop target assembly