Hi my name is Daniel and I will be helping you today.
Im afraid white-Westinghouse spares are very had to find.
If just entered the model number into my spares datebase and its not brining anything up for it.
Im afraid you may have to end up replacing the hood. But even if you could get spares they are usually very expensive on these. But as the model isn't coming up suggest they don't sell the spares anymore.
Sorry its not the news you wanted but if you need anymore info just get back to me.