I think they are called strikers and you can get them from the ford dealership.
If I remember correctly they go for about 17 dollars each but come with the bolt and bracket.
I tried to get mine without the bolt and bracket and they said they don't come like that, you have to buy the whole thing.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft