Hey, I saw your post in the budget light thread as well, mentioning that you couldn't find anything on DX. Anyhow, I took mine apart to check the switch out and measure it. Mine comes in at 12MM, so I looked at SKU 5618 and one of the reviewers says it is a direct replacement for the wf606a.
Personally, I don't see how this could be since this is an on off on off switch with 3 contacts. But, it looks identical other than that, almost like they pulled one of the contact legs out. But, even if that isn't the case, you could always just put a jumper wire across the two contact, and for all intents and purposes it would be identical. I think I will order a 5 pack of these to have on hand anyhow.
Good luck,
VegasF6