I've been looking for one of these as well, for the same purpose. I was able to find an electronics store near where I live that sells the EXACT switch that hella includes. They are SPDT, but don't have a center off position, unfortunately. I think I've resigned myself to having two switches when the time comes to install the backup light.
The only switches that were on/off/on were bare toggle switches. Nothing nice and illuminated.
I seem to be able to find a number of nice switches online, but they are all rectangular mounting holes. A bit of a pain compared to the convenient 3/4" round hole for the hella-supplied switch
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Jeff 2005 Jeep Liberty Renegade
4x4, 6spd, Leather, Sunroof, trak-loc, skids/rails, hitch+shackle, hooks, Alpine/iPod, Thule, GPS, CB, Frankenlifted w/ 31" MTRs
Photos Cardomain