I don't have a scanner, or I'd draw you a picture. Looking at the car from the front, both upper and lower control arms are angled downhill from the frame to the spindle. Spindle extenders will bring the upper arm back to more or less level, adding to their effective length while having no influence on the lower arms and maintaining the jacked-up attitude of the front end.

Denny, are you looking? Could you post a diagram?