Also available in green (not shown).
Used on all major makes of pinball machines.
Blue - 03-8171-10 (Wms/Bally), 550-5030-05 (Stern/DE/Sega)
Clear - 03-8171-13 (Wms/Bally), 550-5030-01 (Stern/DE/Sega)
Green - 03-8171-26 (Wms/Bally), 550-5030-04 (Stern/DE/Sega)
Orange - 03-8171-12 (Wms/Bally)
Purple - 03-8171-18 (Wms/Bally)
Red - 03-8171-9 (Wms/Bally), 550-5030-02 (Stern/DE/Sega)
Yellow - 03-8171-16 (Wms/Bally), 550-5030-06 (Stern/De/Sega)
Williams/Bally reference #03-8171-xx.
Sometimes used with light dome bases #03-8172-13 & A-14265-13.