Some people had PMed asking about getting more of a specific size of mylar ring instead of a pre-made set, so I just updated the mylar ring options in the pinside pin monk store so there's the jjPotC/Wonka set (4 medium rings, 2 small rings) but also 10 packs each of just Small, Medium, and even larger Large rings. Here's a comparison picture of the coverage (they're clear mylar, this is just with the paper backing still on so you can see the sizes easily):
I didn't show it in the sample, but if you want more coverage on the slim posts, you can use a medium ring on a slim post so the protection will extend out similar to the way a Large ring does on a star post.