This is a very rare item. A new old stock genuine Girling set of seals (3) for the Clayton Dewandre servo as used on a number of British cars in the 1950s, Girling part number SP 1976, Rover part number 278525. This type of servo was used on:

• Jaguar Mark V
• Jaguar Mark VII
• Jaguar Mark VIII
• Jensen 541
• Rover P4 90 (1956 to 1958 and early 1959 cars)

There are probably several others.