Hey

It is a Lawson part, which is a bolt co. Contact a Bolt company in your area and ask for a Metric coupling nut M12 x 1.75 The lawson part no. is 60919 This may be for a box of Ten though. If U need just one I can ship you one of u wish to pay for the shipping. Patrick

hey man, I'm trying to extend my NISMO tow hook also but can't seem to find a vendor for the M12 x 1.75 coupling nut. Do you mind sharing where you purchased yours from? Thanks!