The information I find is from Ford Car Parts (aka MPC), 1975 ed, Section 144 page 11, that states clip 377904-S100 was used to 9/29/64 to top cowl inner panel with nut 34053-S8 and clip 370805-S100 for wiring and shield to cowl top with screw 376378-S010 was used after that date. No implementation date prior to 9/29/64 was give. The nut, 34053-S8, apparently was used for the water shield only after 9/29/64.
I need to do a bit more research.
Jim
The illustrations are to small to make out any further information.