Quoted from barakandl:

The feature lamps are DC volts so depending on if your LED lamps are rectified internally or not will determine if there is polarity concerns when used for feature lamps.

Marco should have what you need or close enough.
https://www.marcospecialties.com/pinball-parts/077-5029-00
Using a 555 wedge socket is not mandatory. In bally games like this I have use 44 style bulbs and sockets as a replacement for a broken wedge style lamp socket.