3litre wheelnuts - what & where from

[Roy of the Rovers]

Am I right in saying the 3 litre wheelnuts are open ended (unlike the chrome v8 ones) ?

If so does anyone know where I can get new ones from for when I fit longer wheel studs to the P5? Or if there is any particular technical dimension I need to ask for?
Many thanks
Roy

[dmaxwell]

Mine are open ended and are beveled on both ends too. Makes it easier to put back on.

David

[Phil Nottingham]

They are open ended and either single or double ended