The Jaguar XK120 LT2, also known as the Silverstone, was the factory works lightweight version of the XK 120 constructed with a one-piece magnesium body.
A few lightweight Jaguar XK120s were constructed; around 240 or 242 examples were built with alloy bodies, and were intended for competition.
There were two (some sources say 3) examples of the LT2 constructed; they were intended for competition at the 1951 LeMans 24 Hours race in the event that the XK120C was not ready in time for competition. The C-Types were ready and time and went on to win the race.
This example is a Jaguar XK120 LT2 2-seater racer. It is seen here at the 2006 Pebble Beach Concours d'Elegance.