First off this post needs to start with a disclaimer. I may be wrong or I may be right & in all reality I really don't give a shit what many of you think because I am attempting to help Tom. If you don't like to read my posts please say good by NOW.
Tom, I have given this post several days & there don't seem to be much help with YOUR worn out nuts. I went to the garage to look at a OEM insert retaining nut from a 1985 RX-7. Looks VERY similar to your picture on the right. Following are some dimensions. My GOOD 1985 RX-7 OEM nut definitely is not your nut on the left.
Thread diameter is 1.648 inch.
Thread length including the unthreaded portion above the thread is .419 inch from top surface. (unthreaded portion is .095 inches long)
Hole diameter is .960 inches.
Small counter bore inside diameter is 1.030 inch x .425 inch from top surface.
Large counter bore inside diameter is 1.304 inch x .222 inch from top surface.
Please let us know how this nut measures to your nut.
My car has modified struts for Bilsteins therefore the nut is totally different.
Have Fun ; )
David Dewhurst
CenDiv Milwaukee Region
Spec Miata #14
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