Regarding a bimini top....

If you give the straps a 1/2 twist when securing them to the eyes on the boat, the straps won't vibrate when you are moving with top up. Many of the tops come with plastic pieces. Be aware they will harden and become brittle after a few seasons been there done that......

Here is one of many links for the metal hardware.

https://www.canvas-boat-cover-and-repair-advisor.com/bimini-top-parts.html