Please note these are not UNF5/16-24 thread as it is not possible to obtain this design in UNF any longer, they will however screw onto the airbox with the thread they come with, this will then change the initial thread of the airbox. 

Please note these are the rounded tab type and not an off the shelf aftermarket pointed version

420 Saloon  •  Daimler Sovereign  •  E‑Type S1 3.8  •  E‑Type S1 4.2  •  E‑Type S1 4.2 2+2  •  E‑Type S1.5 DHC  •  E‑Type S1.5 FHC  •  E‑Type S2 2+2  •  E‑Type S2 4.2  •  Mk I / Mk 1 3.4  •  Mk II / Mk 2 2.4 & 240  •  Mk II / Mk 2 3.4, 3.8 & 340  •  Mk IX / Mk 9  •  S‑Type 3.4, 3.8