The Lucas switches are from two different places in the UK depending on price. I got the main ones from : -
http://www.europaspares.com/
I got the rest from here : -
http://www.vehicle-wiring-products.c.../switch-1.html
SW45 and SW42 - don't get SW9 or SW10 the arm is too long.
In the UK they are always on eBay for about £5 each - worth checking.
There are several types of nut that hold them on, hex and two round types.
My switches all came with different ones so I bought a few off ebay just to get the round nuts