I'm not sure on the thread pitch, but can tell you that they are not a special one.
I bought 40 of them for .87 cents each at a local nut/bolt shop in a nearby town. I can hook you up with them if you really need it. Heck, I'll pull one of mine off and take it to them to match up again.
Attention all "Search Police Officers" - what's the big deal with a guy trying to ask a question that may also be buried on here somewhere else? I bet every answer to every question that could be asked about MV's has been asked and answered on here at one time or another. If we were only suposed to search for it, there would be no forum, no sharing of ideas, and no helping each other out - which is what forums are all about.
Search vs. Ask? Who cares.