Recently my hood alarm went off. A rubber mushroom that fits under the hood depresses a plunger and as it wears or cracks your alarm can just go off by it self. Well trusting my Ford parts department (not) I went to a body shop in my area that I do trust.
After 3 days the produced the part, (Ford N806457S - PLUG) at a cost of $1.71. This is not a dependable retirement plan for my friends at the body shop so I paid for the part, made a contribution to their coffee fund and asked for 3 more as spares.
I don't know how much longer we will be able to get the correct part. If you get a spare $5 why not get 3, two for future use?