THE 4 BLACK BILLET ALUMINUM ONES BOLT TO THE VALVE COVER STUDS ON A SB2.2 ENGINE AND KEEP THE PLUG WIRE BACK AWAY FROM THE HEADERS. THE 4 STAINLESS STEEL ONES BOLT TO THE UPPER VALVE COVER STUDS AND GIVE YOU A PLACE TO ZIP TIE THE PLUG WIRES TO WHERE THEY GO OVER THE VALVE COVER.
