I understand sometimes just fabricating things yourself when it's convenient and material readily available, I can make a penny sweat too, with my Yankee Engineering and G.I. Ingenuity. But the saddlebag carpets that are already premade really don't cost that much though. Finished edges, rubber backing. I do have a set of these.

https://wingstuff.com/products/36268...gl1800-2nd-gen