I've got an ebay auction running to sell this mount, BUT if anyone is interested in it, shoot me an offer. My ebay price is to the general public, and my price to MT members is $50 shipped. B&H and Amazon sell the clamp and double ball mount for around $100 new. It clamps very well to a roll bar or the parcel shelf cross brace.

Manfrotto 035 Super Clamp and 155RC Double Ball Joint Head with Platform Release | eBay


For reference:

 

I love my super clamp.