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NAS-451 series plug buttons are still available but not as easy to get as they used to be from aircraft parts sources. Chief Aircraft still carries them in a lot of different sizes.
http://www.chiefaircraft.com/aircraf...ton-plugs.html
There are also rubber and plastic types available from some sources. McMaster Carr has a lot of stuff like this too.
https://www.mcmaster.com/#plug-buttons/=17liugu
We used to call them Willkie plug buttons (a plug at old Wendell Willkie) but most folks just call them plug buttons now days.