99 3.8V6 series 2 upper intake, on the back side where the vacuum line from the break booster I need to know the bolt size that holds the vacuum line. I’ve already got the top intake on and can’t quite tell the size or if it’s tapper bolt or not. -Thanks-

 

If I'm understanding you correctly, you're wanting the bolt size holding the vacuum booster flange to the intake? If so, the parts manual states that they are M6x1x10. I've attached an illustration form the parts manual that may help identify the part.