I think it is 22mm. 20th Century Motor Spares. As a guide up to 2kg costs around £17 to.
Nos Vintage Classic Car SABRE door buffers In White Bmc Mini Ford Vauxhall Rover
THE ZENITH CARBURETTER CO. LTD CD 3320 807 502 NOS VINTAGE CLASSIC CAR PART
NOS Vintage Bosch Complete Transistor Ignition Set 0227051906 Electronic Upgrade
NOS Vintage SWF 12V Wiper Motor 95° 401.460 Built-In Switch Germany VW Tractor
VINTAGE AUTO MEMORABILIA, CHAMPION PLUGS, OILERS. RAM PIPE. COMP TESTER. LAMP
Champion L92yc Spark Plugs box of 10 nos morgan mg rover