All you need to do is buy a standard long reach socket of the correct size then find someone with a lathe who can bore it out to allow it to go over the injector.
Do you mean just skim the splines inside the socket so they don’t foul the spill pipe stubs but still grip the injectors or will I need to die grind some of the splines completely out of the socket?
Thanks a lot for everyone’s help. It’s not the depth of socket that’s the problem it’s me worrying that the spill pipe stubs will foul the socket and prevent it going far enough down robengage the hexagon