The Smiths clock that Nisonger list is a 52mm (2") clock, and the originals were a 60mm.
To my knowledge, the 60mm clocks aren't available new, and they are hard to source second hand.
WardL's link goes to a 52mm like the one I ordered from Nisonger PN 2-CA1100-09. But if you click on the Classics Electric Clock link at the bottom of that page it takes you here Smiths Classic Gauges and at the bottom of that page it looks like they have what you are looking for.
Classic Electric Analog Clock 60mm $165.00
Includes remote reset switch assembly. Black bezel.
Part Number: CTE3107-01HR
Thanks, I didn't know that. The correct chromed double-vee bezel to suit this 60mm clock is available from CAI
Cheers,
Glen
Thank you ,need proper clock fitted early on csx,cob,cox cars,originally fitted on Ford Zephyr MK2,also Sunbeam Tiger and Alpine very difficult to find!!!!