Young Stallion

So 2000 gt Mustang. My A/C line on the compressor has the retaining bolt but is missing the side bolt that has a vent hole I assume or pressure relief hole. Anyways I tried one off a v6 mustang of the same generation and it didn't fit. Does Any one know the thread size. I can't find a gt mustang in a junkyard around me. Nothing but v6 ones there and I don't want to spend $69 on a new one if I can spend a few cents on a bolt. Attachment of picture included in the post.