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I have used them before. They are a great high quality product. This is what i found on their site. FYI, i have made contact with them to see if they are able to to mains also for air cooled Porsches. They are looking into it so hopefully we will have a better product than what is on offer now.
The 'X' signifies the set will give an extra . 001” (0.25mm) oil clearance on a standard size shaft when compared to the H-STD set. The wall size of these HX-STD bearings is . 0005” (0.13mm) thinner than the H-STD bearings, in all other respects the HX set is identical to the H-STD set.
Cheers
Todd
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