silly question

Last night I went to replace the headlight switch on the 77 mgb and ran into a slight problem. The previous owner had replaced the original switch with one that fits a 66 mgb and the plug in has been changed to flat instead of the round. I thought I could be able to find the plugs to switch at the autoparts store but no such luck. Any ideas? I'm tired of the headlight switch hanging down.

I was just working on some wireing but don't rember for sure butI don't think any of my wire use a round plug (77B). However Radio Shack has a lot of the wire plugs but my luck is they don't have one like I need...

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