I believe they're standard Lucas type PS7 / SPB104 hex-shaft switches (Lucas part #31434), available inexpensively from a number of British car parts suppliers (different knobs though) -- e.g. here
or on eBay.
BTW, I believe the two-stage (pull-turn-pull) main light switch is a Lucas type PPG1 switch (part #31126, #31091, #31183 or #51952, depending on washers and buttons) and the hi/low beam switch is a Lucas type FS22 (#31284 or #31226 depending on terminals -- it seems #31284 with standing terminals was used on our Alfas).
'63 2600 Touring Spider (AR 191437, the car that started the 2000/2600 International Register, reassembly in progress)
ex-'65 2600 SZ (AR 856043, now being restored in Austria)
Maintainer of a private 2600 SZ register (not the one in the Netherlands).
Last edited by tubut; 03-06-2017 at 06:25 PM.