need some help with wheel spacer hardware

I'm putting AR172 Baja wheels on my 2005 Tacoma 2wd TRD.
Turns out they just barely rub the caliper, the tire shop said I could buy some spacers if I wanted, so I'm gonna try that.

I'm not a car guy and bit overwhelmed by the specs when I started looking it up.

Here's what I have so far:
Wheels: AR172 Baja 16" with 0 offset
Spacer: Billet bolt on hub spacer, only needs 5mm of clearance so I found a 6mm spacer.

But where I'm getting lost with the lug nut sizes. What specifically would I need for proper thread engagement for the above hardware? Be specific because I have no idea what im talking about

Thank you!

 

Link the spacers you're looking at getting. You'll need cone style lugs as well as hub centric rings for those wheels. Your stock lugs will not work with those wheels. M12x1.5 thread

 

The Tacoma studs are already short as-is. I would not use a spacer unless you plan on changing out to longer studs as well. This is the proper way to go about it.