Those are the same spark plugs used in JDM ITR and S2000 motors. I use them in my motor.
The only difference between the PFR7G-11's and the OEM-specified plug for B18C5 motors is that they're 1 step colder. The OEM-specified plugs are PFR6G-11 for B18C5 motors. The electrode design and materical are the same.
$18 for a set of four is an awesome deal considering that they're $50 for a set most other places.