need manifold bolt size asap!

[bomboi]

i need my DD back on the road asap...I have a 95 k1500 4x4 350 TBI
wondering if someone could tell me what thread size the spring bolts are that connect the exhaust manifolds to the y-pipe. I need to drill/re-tap the old manifolds and my new spring bolts haven't arrived yet. hoping to get it done tonight. the spring bolt kit is dorman part# 675-216

here is one of my manifolds

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[badazzbulldog]

3/8" should be the size

 

[bomboi]

3/8-16 thread? I thought maybe 5/16-18 or M 8 based on the lil bit of bolt I have left

 

[bomboi]

update: i ended up drilling out the manifolds to 5/16 and not re-tapping them. i made my own spring bolts and put a nut on the backside so i didn't have to tap it. i was sick of waiting for the spring bolts to show up just to get it back on the road. btw, ebay had the spring bolt kit of 3, for $6.12 + free ship. my local auto parts store had a set of 3 for $26!