When you remove these plugs are you pulling the wire clip out of the plug?
if you push the clip down towards the plug it will open and allow you to disconnent the plug without the risk of loosing the clip.
As to finding replacements they should be availible from automotive electrical trade outlets, or next time you're at the scrappies just harvest some from the wrecks, these plugs are pretty generic and are found on most brands of cars.

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