This is a pair of excellent reproduction air cleaners, correct for a Triumph TR3, early TR4, or other car with 1-3/4 inch SU carburetors. The opening is actually 1 5/8" and the bolt spacing is 2 7/8".
They are very nicely made, and come with new bolts and correct decals advising that one wash them in petrol every 5000 miles. Quite.
Jaguar XK120 and XK140 also used air filters with 1 3/4" openings, which we can also supply. Please contact us if you need those.