Ditto the "how'd you order one" question.
The switches Ultimarc sells have .25 tabs on em. If you were really worried about it you could probably order some from him.
I have used .25 female quick disconnects on .187 males and, even without plier squeezing, it'll work. It'll work better if you have the right size. Clipping, stripping, and replacing the .25s with .187s would be worth the about 10 minutes of work.