One metal gasket per side. These metal gaskets are only to avoid the aluminum IA to weld itself to the aluminum head due to corrosion. It is -not- a sealing gasket. The rubber O-rings are the sealing parts. When you insert that part into the heads, use a little vaseline and rotate left and right while inserting. It is easy to destroy this O-ring on the sharp edges of the head.Gasket is apparently 134 1783 6405 and two may be needed, from what is see here it looks like 1, but i ordered 2 just incase. $23ea CAD from stealer.