Plug spanner size 308 QV

I’m putting together a tool kit- for possible use, not originality. Searches show pics of the original universal joint style. Searching against NKG plug type suggest 13/16” but this is contradicted by the details on the Tools Page on the classicferrari.Co.uk website. 14or 16mm. What’s the correct size?

I understand it may be necessary to reduce the thickness of the walls. It’s actually a Euro car but I guess the plugs are the same!

 

Thanks To all: to clarify it’s the size of the hex bore of the socket I need to remove the plugs.

 

Thanks again

 

I should have asked this earlier: what is the wall thickness. I shall be modifying a modern socket.

I did find an answer whilst searching earlier but can’t now find it! Doh!

 

Further searching showed OD needed as 1.052”.

 

I have found a pressed metal box spanner that I can modify with a U/J-as shown in previous threads-thanks. Has anyone the dimensions marked A,B,C,D in the attached. (C is OK at 1.052", but I'd be interested what the original dimension was). Thanks Image Unavailable, Please Login

 

Thanks. The box spanner doesn’t have the insert but a “disc with a hole” through which the plug nipple just pushes. I’m undecided as to whether to retain it or put a drill/ file through the hole so it clears the plug.
The 10mm spigot on the U/J makes keeping A <72.5mm a challenge!

 

If it all holds together.
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