This nylon coil sleeve is a very commonly used length on all brands of pinball machines. This is usually used on pop bumpers, slingshots, kickers, and early model solid state and electro-mechanical flipper coils.
Williams / Bally #03-7066 , #03-7066-4
Stern / Sega / Data East #545-5411-00 , #545-5031-00 , and #545-5076-00, #260-0004-00