Im also needing some cushions for my 2004 270 islander. I would have thought someone would have patterns and would be selling them ready to go but I can't find anything
Not nearly enough interest in something like that to have patterns on hand. It's an extremely low demand product.
Besides, it's super easy to make a pattern, transfer it to a piece of plywood, HDPE or PVC, then take it to a local upholster to make the cushion & skin.