1974 E-Type Ignition wires

Does anyone know where I can purchase an original V-12 ignition wire set? I ordered a set from SNG Barratt along with a seperate coil wire. When they arrived the coil wire was too short and 6A and 1B cables had short boots at the spark plug end. When I called them, they replied that the coil wire was the same one everybody uses and the remaining wires are the only ones available. After some reserch I found out that the wires are for the HE XJS. I asked them to look into it further and when they called back they agreed that they had sent the wrong coil wire but if I did not like the rest of the set, simply return them. They weren't even remotely interested in speaking with their distributor to see about the possibility of putting longer boots on 2 wires.
For all the showing they have at Jaguar meets I would have thought they would treated the request as a way to help other owners in the same boat.

1974 E-Type
1996 Vanden Plas
1973 Corvette (454)