Looking for a damaged spare tire cover

[Bonnyboy]

I am looking to purchase for a damaged tire cover that I can use as a pattern to try to make into a new cover for my spare tire.  I have a jerry can that fits into the spare tire but I am afraid that I will damage the existing cover if I try to jam that jerry can into the space under the flap.  I would like to make a new spare tire cover with the top flap held on by snaps only. 

I have a tonneau cover from my MGB which has a similar material as the tire cover that is just begging to become part of a Mercedes.