"Yes I need the front and rear arch shades for a 290 Sea Ray bowrider"
Is the factory mounting hardware present, or are the arches bare? Is it just canvas that is required, or is the complete canvas kit, w/ the stainless bows, supports, awning rails and snaps required?
It looks like the canvas is made to order based on the factory patterns.
My suggestion is to inquire if they will permit an extra cost thread upgrade.
The thread Sea Ray used to assemble / construct my canvas started failing at two years and was completely disintegrated at six years. The rest of the canvas was fine, but the failed thread caused big problems.
The PTFE thread will increase the material cost by ~$200 but IMO is worth the extra expense to have thread the is impervious to sunlight degradation.
That thread was used by me when I designed and fabricated my custom enclosure.