I have a 1974 boler, and the dinette cushions were cut according to these measurements, and they fit quite well: Cushion Template
The cushions that Scamp
Trailers sells will also fit, and they are well made.
Our couch/bunk area has been modified, so I can't help you for those cushions.
We painted the fiberglass and the ensolite with marine paint
in 2008, and it still looks fantastic.