mac, can you remove one Lugnut and you'll see, and with shop-ruler (mm) get a good idea by looking at what's protruding and "extrapolating out" another 2-5mm + any other parameter , off the exposed stud ?
There are those "Calculators" on the web , and sure you'll get lotsa "talk" from forums but in the final analysys nothing like in person -"Live & In Color"