Ford doesn't include them anymore cuz guess what? They want to sell you parts. Problem is, by the time you need them, Ford's already discontinued them from their parts Dept. We end up with Moog, or some aftermarket brand. Luckily Moog, and some top ones, are decent quality.
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Soon as I found out Moog manufacturing many parts for my truck in Mexico I stopped buying their parts.
I went w Spicer which is made in ‘Merica and I liked having zirk fittings. When they failed prematurely I went back to sealed motorcraft.
They have lasted 3 years so far and not a squeak.