Complete kits are available from most of the major parts suppliers. They include everything you need plus a diagram to replace all of the rubber parts. Some are even advertised as tune up kits with additional parts (lamps, polish, etc).

I suggest either The Pinball Resource (http://www.pbresource.com/) or Marco Specialties (https://www.marcospecialties.com/).

For what it’s worth, Pinball Resource is the place to go for all Gottlieb OEM parts.

Depends on who you buy them from. I think the OP is asking because he doesn’t have them.