M_Boats: Hatch boards

Hi All, I have a picture of "Dulcibella" (M-17) with a compas mounted in the lower companionway board. I'd like to do the same. Here's the question... Anyone know if the new three board set will slide right into my 1992? (Has a 2 board set right now) Bill SF Bay M-17 #495 "Tiperary"