I only use Spicer joints after a cheap part failed years ago shortly after fitting and ruined the axle shaft. These fittings have a triple lip seal to prevent ingress of grease and dirt. They can be tricky to install as the seals are tight and get even tighter when the lids are put on, but this gives them a great seal. They also come with clips of different thicknesses to get the right amount of play. I think it's the best you can get outside of the CTM.
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