I think you've got one of the older versions... try this:
http://jon.severinsson.net/civproject/... and browse to the tradecards folder.
The backs should all be the same on the commodity cards.
The faces of the cards should have "E" or "W" on them to help distinguish them when sorting them back into the East & West stacks (if the game is large enough to have seperate stacks

Oddly enough, the page on
http://67.66.187.69/civproject/commodities.html - has the older set of commodities from 2004, which is probably where you got that from.