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Originally posted by compaddict Does anyone happen to known what it is?
No, but I'll wager it's metric! Since metric threads are all measured by the outside diameter of the thread, a set of vernier calipers will give you the diameter, and a metric ruler will tell you the thread pitch which will be a multiple of 0.25mm. Purely from memory, I'd guess it's probably M12x1.75 or M14x2.0; maybe even M16x2.0.
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1973 RX-3
1975 RX-3
1979 RX-7
1985 RX-7 GSL-SE
2004 RX-8 Winning Blue Sport Ordered 1/8/03; Delivered 7/25/03 ; Returned 10/21/03
2005 RX-8 Velocity Red Sport delivered 12/05 returned at lease end 12/07
; Returned 10/21/03 
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