Standard: 112AX switchcraft , 112APCX for oakley by using the sock boards
overview switchcraft:
http://www.mouser.com/catalog/specsheets/switchcraft_110x-m110x_series_cd.pdf
112A for normal use
112APCX for pcb mount like oakley modular (jack pcbs)
...
if you buy cheap - you have to buy a further one
Switchcraft nut:
502-P10001 mouser
switchcraft washer
http://www.mouser.de/_/?Keyword=s-1022-1&FS=True
see attched pdf from switchcraft