Header Gasket Troubles..

1972 Duster 360 motor,
Yesterday driving home from the neighborhood I head the sound of a leaky header, when I looked at the bolts I noticed that the 2nd one was almost all the way out. I thought I could just re tighten and be good to go, but nope it was bad. I noticed that there has been a lot of information on Remflex Gaskets. I am wondering if you all may give some advise on which one to get. Or should I just call and ask. Please help.

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