This is a pair of sidelamp lenses known variously as jewels, pips, prisms, telltales or medallions for Jaguar XK120, 140, 150, Mark VIIM, VIII, IX, or Mark II MK 2. They mount on top of the housings for the sidelamp, or parking lamp. These are made on the original Lucas tooling in England, and are correctly marked "LUCAS." The price is for one PAIR.
The Jaguar factory part number is C4691.
Many people simply glue these in place with silicone RTV or similar, but we also sell the correct clips (C4098/2) for $2 each.
For the L563 sidelamp assemblies for the Mark 2 or early XK120, the L490 sidelamps for early XK120, or the L513 sidelamps for a late XK120, XK140 or XK150 or Mark VIIM, VIII or IX, click on one of the Related Products links below.