Ghost, The terminals on the element are a little over 3/16" dia. (I don't have a metric scale handy)or .187". 8 gauge has a dia. of .1719" or 4.37 mm. 7 ga. has a dia. of .187", 6 ga, .2031. Since the stud size measures a little over 3/16" I suspect that 7ga would take a little reaming. The 6 ga would be about perfect.