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Size of Vanguard inspection port?

Hi everyone, yesterday I got to sail for a whole 15 min before I pressed my knee against the edge of the inspection port as I always do, and it shattered.

Does anyone know what size of RWO port this might be? I believe it is the standard size from the Vanguard factory (boat is a 1994 Vanguard). Thanks for any help and advice! unnamed (6).jpg
Thank you very much. I unfortunately do not have the boat with me but it does seem to be right. It's definitely smaller than a 6" but I wasn't sure about the 4" size. Appreciate the help!