They make a six lug version that will fit the SRX. The picture that Tire Rack shows with the Mille Miglia MM-S on an SRX is not accurate. Click on the "17 x 8" size under the MM-S wheel and the correct specs will appear at the left of the screen; 6 lug on a 115 mm radius.
BTW, if you install these, or any other wheels for that matter, without the tire pressure sensors, you will get soon get an error message in the dash "tire pressure sensor malfunction" or something similar. Since I only run these snow tires during the winter, I left the sensors on the original wheels. I just press it, and it goes away. But it will eventually reappear. I think the sensors are around $75 each!