If you have a Xenon (1980) or Kings of Steel (1984) you can now purchase these buttons from Shapeways in not just polished white but also, blue, red, hot pink, and purple. I believe there are some other machines that use these as well back to the EM era.

Especially if you have a new CPR playfield, what better way to complete the restoration, than with nice new buttons. These have been test printed by Shapeways and test fitted.

https://www.shapeways.com/model/1477577/bally-pinball-rollover-button-c-587-6-ss-em.html?li=aeTabs

and for the range of items head here with more items soon to be available.
https://www.shapeways.com/shops/Dutch-Orange

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Rollover Button C-587-6 (xenon & kings of steel).jpg
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here is the list for mini rollover buttons on the pinball database, though I am not certain if all these games use exactly the same button as the Xenon and Kings of Steel. You would have to check the part number for your machine.

http://www.ipdb.org/search.pl?any=mini+rollover+buttons&sortby=name&search=Search+Database&searchtype=quick

eg Hang-glider appears to have the same ones as well but please check you game specific manual to compare part numbers.

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thanks for the support as noticed I got a few sales of these through Shapeways.

same as the original ones - it is just a reproduction