Hello and welcome!
There is a parts list online for motorhomes, but not for Travel Trailers.
If you had a “Minnie Winnie” as you said in your post you could look it up. But actually you have a Minnie 2401RG, not a Minnie Winnie. See, the Minnie is Travel Trailer and the Minnie Winnie is a Class C motorhome.
It’s an easy mistake to make. The difference in terminology doesn’t seem all that important but when it comes to parts, service and even asking for help on the forum it makes all the difference.
Now, about your skylight. I think you’ll have to contact a Winnebago Toyables dealer. An alternative might be to measure the outside dimensions of your existing skylight and check with Icon Products, they sell replacement skylights.
https://www.icondirect.com/skylights/