Bumping myself, but it is Orphan's fault. They have already gotten me the lid seal for the Peppina.
It is a very snug fit and there are a couple of hints I would pass on if you get to install one of these.
1. Unless you specifically are looking for it the slot in the seal that the lid sits in is invisible, it is just where you expect it to be but you may need to scratch at it with a fingernail several times before you catch it. Less a slot but more a shallow razor blade slice into the inside of the seal.
2. The stiffness on this seal is rather high, so it can be a bit resistant to work into place. I ended up warming mine up in hot tap water for about five minutes to get a bit of extra give.
3. I was able to get mine on just fine with out removing the handle or the steam wand, but as there are a number of lid designs, so this is a full on YMMV setup. The seal did not need any extra lube.
I just got the slot of the gasket onto the rim of the lid and worked with my left hand turning the lid while using my right thumb to press the next small section of gasket lip onto the lid.
Once you get about 80% of the gasket on this way the left hand stops the work of turning the lid and switches to stretching the final segment of gasket out while still pressing it onto the lid with your other thumb.
Total time with heating the gasket included was about 7 minutes. I am going to fire it up in the morning to try it out.
Go shots, go Saints.

-Cecil