I do have a stock rad. The shroud I bought was from Year One and it had that number on it.It was a terrible fit ,I had to slot the holes. It lasted about 1 year,then cracked across corner.I am using a stock clutch fan 7 blades.18 inch
i'm gonna' start something here,but i don't think the stock a-body shroud really does much
if your fan is an inch from the rad.
I think a shroud benefits units like GM where the fan is 5 or 6 inches from the rad.
Some of the home made / aftermarket ones block half of the rad from any air flow!
..i've been wrong before.