I would recommend getting the part number from the Four Winns website. It looks like it is 060-1297
PRTLGHT,LWMAR RND END #8-1/4"X17-1/2 NLA. The first number, 060-1297, is the Four Winns#, The description shows that it is a Lewmar part with dimensions 8-1/4 x 17-1/2 inch. Four Winns says it is no longer available through them. Try looking online, maybe ebay, Great Lakes Skipper, or??? If the window frame is not significantly distorted, you might consider having the outside frame cleaned, scratches filled, and painted to the correct color. This might be possible to do without removal, especially if the boat was out of the water. Otherwise, the window could be removed, refinished, and reinstalled.
Here is one from ebay:
https://www.ebay.com/itm/Complete-Lewma ... 0706.m4781