I recenyly purchased a 1975 20' Bayliner Admirality 2050 Cuddy and it came with a biminin top and 5 other pieces that zip/snap together and cover the entire boat from windshield back. I need to replace or repair the piece that zips to the back of the bimini top and hooks to the lashing hooks on the back of the boat. Where can I find a replacement? Are they still available? Thank you in advance