Well, I don't have the blue prints, but I do have an old set in my basement that I can try to measure! As far as I know the DS II and DS III had the same size cuddy opening. (D&R Marine lists the covers as fitting both. (I'd say just order a set from them, but the price is a bit steep!) The ones I have in my basement (original set from my 1979 DS II) are a bit delaminated and shop-worn, I bought a new set from Rudy (D&R) several years ago and have kept the old ones around. I might try to trace them and make a pattern.