Each Sonnax enclosed thrust bearing provides two reliable solutions:
1.Replace worn/damaged front cover thrust bearings in Ford FNR5 and Mazda FS5A-EL converters
2.Replace defective OE thrust washers in Subaru TR690, TR58 converters
The difference is that one of the bearings features increased thickness (vs. OE), which allows for resurfacing of opposing mating surfaces for optimum performance:
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