Jim,
The cutout in the seal is a condensate drain and is placed at the bottom, as per your photo'. The 2 seat Elan's tail light units are upside down when compared to the +2 and Europa (and the E-Type Jaguars). If the seals from the +2 and Europa are used on the 2 seater, the drains would be at the top. Not ideal. Hence the special seal for the 2 seater.
Cheers,
Colin.
JimE wrote:In changing a rear bulb on my Sprint I noticed the lens gasket has ELAN inscribed on it. Must have been a special batch made for Lotus at the time as my +2 and Europa lights do not include the same. Just a fact for the library.