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Autolite Racing plugs

Does anyone have any experience with Autolite Racing X plugs?
I bought a set off of Ebay that were supposed to be Autolite Racing AR 3932.
When I got them they were Autolite 3932X plugs. They have a X shaped tip on them
that I have never seen before.A search turned up nothing.
Any info at all would be greatly appreciated.
Thanks,
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