Clay Harrell - the master of EM restorations and repair - suggests Krylon Ivory.
Here's what he says:
Use Krylon "Antique White" if you are doing a partial cabinet repaint (like the front of the cabinet) to match a yellowed cabinet finish. Works great on Gottlieb wedgeheads. If doing a complete cabinet repaint, Krylon "Ivory" is probably a better choice (it's less yellow looking).
And here's the link to the whole document: