I have an old one that I used to keep on my Bonneville. I'm not sure what brand it is, but if you want it, I can sell it to you. Only problem is that it has a hole in the back rear quarter panel section where my antenna was.
I have the wolf automotive "noah" custom-fit car cover for a 2G intrepid that I don't use anymore, also has a small hole for the antenna in the right rear. I think my parents paid somewhere around $200 for it new. Let me know if things don't work out with 2001_300M.