Regarding how terrible the website for MILLSCANVAS.COM, might be:
--they are really professional canvas makers--for about five generations. Judge them on their canvas products and not on their web design
--the website, although described as "terrible", clearly says the following:
Today, Wm. J. Mills & Co. can supply canvas for every available Whaler® model--through your dealer or your local marina, or directly to you. Please contact us for more information about our Boston Whaler® capabilities and parts.
I don't understand the reticence to contact the Wm. J. Mills & Co. via telephone--they are modern enough to have a telephone--and inquire with them about the deck mounting hinge needed for installation of their canvas on a Boston Whaler OUTRAGE 18.
I am not sure exactly what your expectations were for the Wm. J. Mills & Co. website. Do you expect they will have on their website a complete listing of their entire inventory of all parts used in making canvas for all Boston Whaler boats?
Do you expect the Wm. J. Mills & Co. to have every set of instructions for every canvas product they ever made available for you to download?
I think you ought to approach this with a bit of perspective: here is a firm that made canvas for a Boston Whaler boat 28 years ago. They are still in business. They still have the patterns to make more canvas. They probably still have all the parts. You just need to contact them. I am not sure why you think that this forum is supposed to be a conduit for you to obtain information from Wm. J. Mills & Co. Pick up the telephone and call them. Also, I would not make the first thing you tell them that you think their website is terrible.