New Seal for Kitchen Sink Plug

After only twenty years the seal of our kitchen sink plug was crumbling and the sink no longer holding water. Here is a spare part design for the type of sink plug shown in the photo - manufactured by "Blanco".
Sink Plug Seal is the seal itself, print it in flex material. Sink Plug Center is holding the seal in place with help of the the center bolt, print it in PETG (or PLA).
Both parts are printed upside down and with supports (bed supports only). The surfaces carried by the supports, which are a bit rough, are hidden inside after assembly.