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The seal / gasket locates over the edge of the housing. One seal fits both sides. I hope this helps Peter

I looked into getting some reproductions made here in the UK, but price was prohibitive with a huge minimum ( thousands...). All they are is a straight-shanked nut with a tapered collar - retained by a pressed flange - free to rotate on the outside of it. Not a unique design by any means. I was using Ford wheel nuts for a while and they were very similar and even the likes of Watanabe use the same principle today. These are some of the original 1970 type works version that I've got. On one of them the pressed lip has been overcome and the collar is free to come off, showing more detail: Useless Trivia Dept: The above have a domed head. The Nissan works rally team soon switched to open-ended versions, as - apparently - there were occasions where debris/mud/small stones could get into a nut during rally service wheel changes in the field, stopping them from being tightened properly...

Well you know where to get a set, just in case your car becomes not so nearly perfect. No need to give away panels at this end.