It's my understanding that the 50's production numbers weren't as well recorded as the earlier years.. which would be why you're having difficulty locating them.

I've heard of a few books that list this kind of information, citing 'insider' sources, and I think we have a member here who posted approximate numbers once with the numbers skewed to prevent 'theft' of his/her stolen numbers.. seemed a little too 'cloak & dagger' for a site with a bunch of dudes sharing information.

an idea is only stupid if you think about it rationally.