Go to Infiniti and buy a replacement nut.

 

I got it covered guys don't worry.

 

In the future, if you have a Fastenal nearby, they'll for sure have what you would ever need.

 

Just in case anyone comes across this thread in the future via Google, here's the strut tower nut replacement as I had to chase one of these down today:

Nissan PN: 55269-2Y00A ($5ish per nut)
Lowes/Home Depot: (Metric) M8 1.25 flange nut (comes in a pack of 2 at Home Depot for just under $2)

Auto parts stores were of limited use as they tried to convince me to use a M8 1.25 non-flanged nut with a washer.

Enjoy,

Mike

 

Thanks for posting this. Currently, I have an issue with either my nut or stud being threaded on a new KYB strut mount. I already have spare old nuts available (the new mount came with its own new nuts that I put on) and, as a result, I would need to go to HD and pick up this M8 1.25 stud? Thanks.