This is a new wheel cylinder for early 1946-1950 (Before GT series VIN) models.  There are 2 required per car and sold separately. 1946-1950 models (Before GT Series) 

This is a new left hand front wheel cylinder for all cars from GT series onward. 1950- 1955 (From GT series on wards)

This is a new right hand front wheel cylinder for all cars from GT series onward.  If you need the left hand front wheel cylinder that would be RG7060 1950-1955 (From GT series onward)