Driver's side lower caliper bolt is missing on my son's 350z. Is this something Lowe's stocks or dealer only?

Need to fix this quick. Planning on going out tomorrow.

 

Even if you can find this part at Lowe's or Ace you shouldn't consider it a permanent fix. You may be able to buy a fully - threaded bolt to cut to fit but it's not guaranteed to hold up to the torque and heat cycles of a brake system.
If it were mine I'd hit a dealer or salvage yard and pass on a quick fix.

 

I got mine form home depot 10 years ago. Still holding up. Not sure of the thread/pitch though

 

https://www.courtesyparts.com/search...r=caliper+bolt