Even a five year old boat can have parts that are near impossible to locate. One of the downsides to holding onto a boat is by the time it needs non-engine parts, they can be extremely frustrating and challenging to locate. A 90 Chap is almost ancient at this point and you will need to keep an eye out on ebay. Of course people get to the point where they have to have parts custom made. Locating a donor parts boat is also a possibility and I bet actually easier than locating just the louvers. My 02 Chap was produced from 2001 up to 2008 in its identical form as Chap had a habit of making the same boat for a long time in the 2000's and even parts for mine are very far and few. Cecils marine is the gold standard for Chap parts but don't think you will have much luck going back to what you need. Be happy you don't need a windshield.
