Wrong radiator cap. Does it matter?

[ryanthevan]

I preventively replaced my radiator cap today. Motorcraft replacement ordered from a reputable seller on eBay. Their tool indicated that it would fit my 1993 4.0.

upon installation, it looks to be a slightly different model. And while it nestles in cleanly, the arrows don’t match up perfectly with the vent tube.

can I use this cap. Or order a replacement with the same model number. Thanks!

 

[ryanthevan]

Potential answer from another forum. But I’d be interested in other opinions.

 

[rusty ol ranger]

Id be more concerned the new one is 16lb and the old 13lb

 

[ryanthevan]

Yeah seems like they don’t sell the rs77 13lb anymore. And the forum screenshots attached above suggest they may have been changed by ford from 13 to 16lbs.