<html><head></head><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1505247969788_3187" dir="ltr">Now that I have the axle hubs off the rear axle to replace the bearings and seal I find I have two different hubs on the same axle. One has an O-Ring to seal beneath the gasket and the other has no such circular groove for an O-Ring. I am sure the one with the O-Ring is original to the car (BN2) but what is the other one off of? Do I need a matching hub with an circular groove for an O-Ring or will it be OK to mix and match? BY the way, neither of them had the bearing spacer. Is that really needed?<br></div><div dir="ltr" id="yui_3_16_0_ym19_1_1505247969788_3344">Mike MacLean<br></div></div></body></html>