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What size bolts for the muffler flange???

20REBEL20

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Bought a magnaflow 19429 street series cat back system second hand that didn’t come with the hardware kit (muffler flange bolts, nuts and washers).
I know that I need new hardware to through-bolt on the new muffler but I can’t find any info anywhere on what size (diameter-pitch x length) that I need. The wife ran off with our only other vehicle for the day to run errands so I can’t just pull a bolt and run to the store.
Today is also my only opportunity for a while to do this install and being it’s Sunday MagnaFlow is closed...
Anyone know what size I need?
TIA
 

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