H&R Hub-Centric Wheel Spacers spacers in 5x114.3 bolt pattern with the following widths: 5mm, 10mm, 15mm, 20mm, and 25mm. Extended wheel studs are included with each size. Priced per pair, meaning Quantity 1 is for two wheels only, and Quantity 2 is for all four wheels.
Reputable Wheels Spacers can safely provide you the flush look you are seeking, and/or clearance with larger brakes. In our case, we've ran both the 5mm H&R TRAK+ Wheel Spacers on our Blue Si to clear an aftermarket set of wheels over the Hyundai Genesis Coupe Retrofit Brembo Brake Kit. We are also using the the 20mm H&R TRAK+ Spacers on the factory 18x8 +50 wheels, making them +30.
These spacers are hub-centric, and come with extended studs; these two factors make this product one of the most safe options regarding spacers. We have used them on the circuit as well, and they have not failed us.