Two options.
I bought a similar light in plastic with led from 12 Volt Planet Ltd ,price including vat and delivery £38.32.
Product code P01133
Part number XS9410MS
Fitted well as dims all but identical and it swivels all ways.
I guess delivery cost would the same for two.
Secondly I have sourced some 15 mm dia rocker swithes off ebay for £2.99 each.
I will let you know how it goes when I have fitted one as I will have to file down the lugs on the light that hold the black rocker .
Watch this space
” WISH “