I have a brand new in box Monster Cargo Tower bimini top. Black color, size medium. Very durable and clean looking. Mounts to your tower. Easy to store boards and/or a tube on top. Link to the specs below:

https://www.monstertower.com/cargo-rack-bimini.html

Sells for $899 on Monster's website. Selling for $625 + ship from SC. May consider partial trade for new prop... let me know what you have.