I have the one from K&N. I like it.  Just have to measure the tube to get the right diameter. I like the deflector shield built on to it. 
Especially when the fan clutch locks up.  

Located in Harford County Maryland 

BTW:  Just noting an odd quirk:  If I remember correctly, the earlier OEM models had a shield, but when it was done away with (deemed unnecessary and another way to save of few pennies per car in production costs?), the stamped directional orientation instructions in the top cover remained on the stock cap, resulting in much puzzlement.

6 VOLTS/POS. GRD. NW INDIANA

Those were pretty much a holdover from the flathead days. No rhyme or reason to have the shield that I can guess.





54 Victoria 312;  48 Ford Conv 302, 56 Bird 312
Forever Ford
Midland Park, NJ

Yes, there was a reason for what is being called a shield here. It was a Deflector, intended to direct ventilation air into the engine.  For some reason it was deleted on later engines & keeping the oil  cap " filter clean"  apparently wasn't really emphasized, leading to many sludged up engines.
 


Paul

I just thought is was a good idea, to keep the road dirt coming though the fan to go directly on the K&N filter. 

Located in Harford County Maryland