I'm missing a few bolts in the exhaust manifold and need to know the length of the bolt to get... I"m pretty sure it's a 3/8-16 but they come in 1, 2, and 3.75 inch lengths. I'm taking a beach trip in the bronco tomorrow and would like to get it fixed today.... I'm at work so I can't just take one out right now to check it. Thanks!