What size are hood bolts?

Johnny71dusty said
Mine is 1971 duster . I went to Lowe’s and got 3/8 16 and 18 per suggestions and was too small . I’ll be the at eBay set but 5/16 for sure to small and 3/8 is as well

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If this is an actual picture of your hood, I won’t guarantee they are 5-16”, but I will guarantee they are not 1/2”.