I have an old Hagstrom Swede guitar from 1970, which has two 3way switches at 90 degree angles, a 5lug for pickup selection, and a 7lug for tone select. Switchcraft seems to have 5 and 9 lug. If not mistaken, the SG Custom with 3 pickups uses a 3way 7lug switch, correct? If so, do you modify a 9lug? Or is there a part#?