39-40 little flathead 60 h.p. Ford v8 crankshaft driven fan pulley(no fan). I know it fits the smaller 60 h.p. Flathead v8 because it is approximately 1 1/8 i.d. And too small for the “regular” flathead that has a larger I.d. $30 shipped CONUS. No PayPal—No Texts! Your postal m.o. is safe with me as I have been a HAMB member over 7 years. Thx John 979-595-7324 cell in s.Texas.