[Mgs] Headlight relay's

[Bernd]

Anyone have any idea of where to purchase headlight relays from, I'm looking for the 30 Amp and of course 12V, when I tried my local auto stores they looked at me as if I was from outer space, when I told the guy from Auto Zone there were to be used on an MGB he said " is that a Ford?" after I explained to him what kind of car it was he still thought it was was a Ford, go figure. 
71 MGB