Julian Date Codes vs Cowl Tag Build Dates

[ZLP955]

Eddie, with no YH production from late Feb to mid-April, and (as far as I'm aware) no Z28 production issues caused by a shortage of 15" wheels, Kelsey-Hayes must have produced a large number of YH coded Rallys in the February run. Assuming that the April wheel production dates were scheduled based on monitoring demand for those wheels through March, it's unlikely that stocks would have been allowed to fall too low. This is purely my own opinion, but I would think that an 04C car would be more likely to have the late Feb wheels.
The question of build dates for 04C is key to that opinion though; my reading of the 1969 calendar is that 04C is the week commencing the 14th. My 04A LA car has a Fisher body scheduling number on the trim tag 'Bxxx' and from the NCRS shipping data, the official production date is April 1, 1969. That said, April 28th-30th would be the 5th week and I've not seen an 04E trim tag before (though that doesn't mean there aren't any), unless those dates were counted in 05A?