Two tails

Chevrolet left taillight 

Corvette right taillight 

Tail lights seen on classic cars; here, a 1955 Chevrolet Bel Air and a 1956 Corvette.

Three tails and a head

Tail lights and head lights seen on classic cars.

Duolamp tail light with blue eye dot

Duolamp taillight 

Gas cap and Duolamp tail light 

Left side head light 

These all have glass lenses.

Lynx Eye Blue Dot

Many customized cars sport Lynx Eye Blue Dot tail light lenses.

Blue dot I

The deep red turns almost purple in the twilight.

Blue dot II

The red stands out against the yellow.