lol...ah man sticky de ting fuh himself oui!
but seriously...the bolt spacing is measured as the diameter of an imaginary circle, the circumference of which passes through the centre of each bolt so u're wanting to know if the bolt pattern is "5 x (diameter of imaginary circle)"
measure from the exact centre point of the hub/rotor to the centre of any of the 5 bolts (with a dividers or ruler or whatever) and multiply that figure by two to get ur answer
hope this helps