Ford provided an answer...unfortunately in this case they actually provided TWO answers:
http://www.vanpeltsales.com/FH_web/F...48-51truck.jpg
and
http://www.vanpeltsales.com/FH_web/F...g_1949to53.jpg
Looking again, I think the two-gasket drawing is of the rare HD Taxi/Police pan with cleanout and not a truck pan, but the issues look identical! Take your pick and go for it!