You didn't say what kind of machines you are working with, but you can find replacements for some machines online.
I threw my old ones away & found replacement ones for my featherweights here:
https://shop.sew-classic.com/searchq...=felt+drip+pan
Here is another source for singers:
https://singer-featherweight.com/search?q=felt+drip+pan
and here is another:
https://www.vintagesingerparts.com/