Alright everyone in the USA, here;s what I used:
From PEI-Genesis (866) 611-1089
part number: SCH F4UGRF1501C0415 (all the '0's are zero's, not Letter 'O's...)
The cost each is $15.13 each and they come with black switch caps.
They are 4-pole so they are a little deeper, but they're standard Schadow switches, and you may choose to do as I did and parallel poles for improved reliability.
Shipping on my order was $8.00, so buy all that you need in one go, rather than one at a time, or you'll end up paying more than you need to for shipping.
Keith