5x110 is a GM compact and European GM pattern. You will find it on Chevrolet Cobalt, HHR and several Opel and Saab models. We stock 921 wheels drilled 5x110.
Measuring is simple: count the studs, then measure the diameter of the circle they sit on. Five studs are measured from the far edge of one hole to the centre of the one two holes away; six or eight studs across opposite centres. Ordering the wrong pattern is the most common fitment mistake — if your measurement falls between two patterns, confirm with the vehicle's spec sheet first.