Was at the local Ford dealer here and was looking at the prices for factory UVCH's and Motorcraft glow plugs. Now this is a truck dealer and these guys know PSD.
The parts guy brought out a glow plug and a harness for me to look at and you could have floored me but the harness had a sticker right on it "Made in China". Guess those ebay harnesses are probably just as good as the factory ones.
I did buy the Ford rear rotors and they were made in the USA!
Jeff

 

Two choices, go to international dealer, or call parts guy ed for oem ford. Not sure if international has went to the china version yet, but I do know they are less than half the price of local ford dealer. Parts guy Ed does much better on price, but ask him if OEM is really china, or if its a local deal.

 

One more choice:

Riffraff Diesel: Ford Valve Cover Gaskets

Riffraff Diesel: Motorcraft Glowplugs