Looking for a replacement mast "foot" for a 18.5' Hunter made in 1990. Hull #HUNCO20L990 if that's any help. The mast was made in France by Z-Diffusion of La Rochelle, France; Mast Type: H-18; Reference: 3446 B1. The mast is aluminum. Also there are three pop rivets holding the mast foot on to the mast. Are those pop rivets Aluminum, Stainless Steel, or Steel? Will need three of those pop rivets too. I have provided two photo's to help in the identification. Any help in this regard will be greatly appreciated.