I wish... but it has to be made of something that will withstand the heat!
Idealy you would make a mould and fill that with high temp silicone. I struggled to make a decent mould. The shape is odd (grommet).
What i did was to set the extended washer, washer and bolt as it would be screwed in (without the grommet in place ). I used a small bolt that had the correct thread. The filled all the space with high temp silicone as best i could, trying not to leave any air gaps. Finally i “drew” the depression in the middle by removing silicone with a match or something as wide as the original.
As i said, not perfect, but dirt cheap and has worked a treat. Ill try to get some pictures loaded.