Assembly includes Magneto head and adjustable advance. Magneto base has the 2-hole mount flange like 1941-69 type distributors on 1941-1969 FL models.
Base is shotted to allow advance and retard manually. Drops in the distributor hole and is manual advance. Check cylinder head, push rod covers, relay boss and cylinder clearance before installation as the magneto is taller than the original distributor. Attach with one hole or drill and tap additional hole. Order mount bolts separately.