When purchasing a rear wheel bearing set for the VW Split Bus and the VW Thing, the seal between the reduction gear housing halves is included in addition to the bearings for the gearboxes.
If the bearings do not need to be replaced, but a leak needs to be repaired or for some other reason the assembly needs to be disassembled, the seal is also available separately.
In case you haven't thought of everything, check out the "related parts" tab, which lists several parts that may be useful.
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