I have a l984 Cat/ 25 that has a square white transparent skylight mounted flush in deck between the forward hatch and bow. The size of this plastic is approx. 3"x8". This became cracked and then eventually broke . As this is the first summer I have owned the boat, I am not familiar enough with the parts availability and wonder if this is a replaceable stock item or if it would have to be custom fitted? I presume the purpose of this was to let more light into the v-berth area, however it would seem that the location on the deck would we subject to quite a bit of traffic and vulnerable to more weight and wear than the material could handle. Has anyone experienced this problem and if so what was the solution?? Thank you for any insight you can offer..