Replacing - or attempting to replace - rear section of 1/4'' brake pipe on my 1999 C2500 Suburban 5.7l with JD7 system. Intended re-using flare nuts (on home flared copper/nickel pipe) but one of them is going to end up destroyed in the removal process so need to source replacements. Inevitably that means in the UK - Rock Auto don't list - and to save time but I don't have the size at hand. Any info that lets me identify what I'm looking for in the UK urgently required and greatly appreciated!
TIA.
TIA.