They say; "There are many parts for specific configurations that are not listed here. If you require 5280 Mast Components not listed here please contact us with details." This one looks pretty close but I'd call them anyway.
Mast Boot for Metal Mast 7953P Performance Section: MMP-7953PMB:
Mast Boot to fit Metal Mast 7953P Performance Mast Section (7.9" x 5.3") and special fabricated Deck Collar. Hard molded white PVC Mast Boot is 3 1/4" high x 10 1/4" long x 7 1/2" wide.
Low-Profile Deck Collar Assembly for 5280: K-10946:
Low-profile 5280 Deck Collar Assembly, for keel
stepped masts. Deck Collar Rings are bolted together (with Deck in between), using (8) 5/16" bolts and nuts. Mast Support Tabs bolt through Collar Rings, 3/8" bolt is later installed through Mast and Support Tabs preventing the deck from rising under rigging
loads. Base size is 11 1/8" x 8 3/8" x 3/4" high. Deck Collar Rings and Mast Support Tabs are cast in 356 Aluminum with black epoxy
finish. Kit includes (2) K-10926 Low-profile 5280 Deck Collar Rings, (2) K-10931 Mast Support Tabs, (1) 3/8" x 7" bolt with locknut, and the K-77509-24 rubber Mast Wedge. Original Assemblies used the K-10768 Urethane Mast Collar (no longer available), as shown, which mounted between deck and upper Deck Collar Ring, requiring removal
of Deck Collar Rings when unsteping the mast.
Mast Boot for 5280 Low-Profile Deck Collar: K-10926BLP:
White PVC Mast Boot helps prevent leakage at the deck. Slid over mast prior to stepping, it is then secured with a hose clamp on K-10926 Low-Profile deck collar ring and one around the mast. One piece molded construction for optimum fit. 50 D