Hi all. I tried to drain my gearbox oil and found that my American sizes will not fit without slipping and messing up the bolt. I thought I'd look for a socket set on E-Bay. I got these names from the Clymer Handbook. I need them for a '67 TR6 and '68 Bonnie. I would hope they would fit both. I remember hearing about these sizes back in the late 60's when I got my Spitfire,

but I must have used/adapted pliers, wrenches, etc. because I didn't have the money to spend. Thanking all in advance.
Pochie