@David Lawlor You will need to find a 171 glass globe. The mantle with be an 164 X. This is a double tie and there are several different versions and they all work. You can find both the globe and mantle in the UK and ebay may be your best option. Cheers, Norman
@David Lawlor This catalogue shows the correct type of 171 globe (Deep) for the 246A https://classicpressurelamps.com/threads/x246a-datasheet.1772/
@David Lawlor go to google and if you type “Tilley Lantern Parts” select the bay of evils option you will find English suppliers that can provide most of the stuff you’ll need. Please also see the Fettle Box associated with this site, they’re very good. Cheers Pete
Base-camp in Littlehampton may be able to help, not the cheapest, but worth a visit to see their collection
I've got a large amount of Tilley 171 glass globes to get rid of - £11 each + postage. Send me a message if you're interested...