La Pavoni Lever Heating Element Gasket or Seal code 1186641/465225 is located right on the heating element (inside part).
Position 8 in the attached scheme pic. Please view second photo for your reference.
Check the 3rd picture from the product page to better understand what you have and what exactly you need.
This seal is used on the newer style steel heating elements.
It’s used inside the LP group head and is a standard part compatible with:
1. La Pavoni Stradivari Lusso STL, STH;
2. La Pavoni Stradivari Professional SPL and SPH;
3. La Pavoni Europiccola EN, EL, ELH, ERG;
4. La Pavoni Professional PN, PL, PLH, PRG, PDH;
5. La Pavoni Romantica GRL;
6. La Pavoni Stradivari Gran Romantica SGR;
7. Gaggia Factory G105, G106.