Magsafe 2 power adapters?

start with the macbookpro support forum

http://www.apple.com/support/macbookpro

http://support.apple.com/kb/HT2346

Might start with the patent office, or ring up Jon Ivy's.

http://www.google.com/patents?id=C-IOAAAAEBAJ&printsec=abstract&zoom=4&dq=steve+ jobs+inassignee:apple&source=gbs_summary_r&cad=0_0#v=onepage&q=steve%20jobs%20in assignee%3Aapple&f=false

If you need the size of the current one, buy a box of chicklets gum and measure one. For the previous version that actually worked it was a small rounded design that, unlike the new one actually stayed in should you happen to set your laptop down on the couch or bed for a moment. (Because the new one is big and clumsy, it falls off constantly. So, if you find yourself mysteriouly out of power on the road all the time, you have the new one!