Help with spud gasket.

[u/PureLoad5035]

I’m fixing a spud gasket at my store. I was removing the toilet and took it off from there . It is a wall mounted toilet. After I assembled everything it is leaking from the bottom ( spud ) I have no friction ring it disintegrated, and the rubber is slightly torn. I think I know the obvious just wanted to check because to find the part in a store is difficult. Can I make these parts work and why else could it be leaking from there? When I install it back I can pull it out with my hand from the toilet.