The thread size is 12x1.75 on my towhook (same cheapo from ebay) works well. I have added a coupling nut as an extension (as shown in my album) for the Nismo bumper.
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INGEN CAI BERK HFC Z1 SS BRAKE LINES
ICHIBA 15mm SPACERS 25 ROW OIL COOLER Z1 ENGINE UNDERSHROUD COVER Z1 AKEBONO ROTORS QUAIFE DIFF w NISMO DIFF COVER WHITELINE BUSHINGS
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