Where would one get a 17/64 box wrench?

ocdart found the same thing I did, but at a different supplier: http://www.mscdirect.com/product/details/85380517

If it's for bleeding brakes with a chinese brake cylinder that nothing fits, I'm pretty sure I ran into that and got this 7mm to work:

http://www.amazon.com/dp/B000N322Q4/?tag=joeychgo-20