OK.. yes I AM aware of what is involved with replacing windows on a boat. However I really would like to have screens in the Port and starboard rear cabin windows. I have a leak in one so since I need to take it out to fix it right, figured I'd replace window all together with one with screen. NOW.. any suggestions on where I might find some that will fit. Any idea of the size of them? I have a 1974-75 Pearson 28.