Need help finding the right FFC connector
The information you've been given is definitely inconsistent.

That said, 0.5mm pitch seems the most likely candidate as it:
a) matches the stated pitch in the schematic 
b) dimension D in the data sheet for the 10 way connector is 5.5mm which is what it says for the loom width in the manufacturer's diagram

The tolerance on the FPC width is +/- 0.05mm so any receptacle between 0.3mmm and 0.33mm should be fine

Your loom appears to be straight (no rounded corners)

Something like this should do: http://www.digikey.com/product-detail/en/molex-llc/0528921095/WM9203CT-ND/1089660

You should really get some samples before going too far into design/manufacturing.