Real stupid question

Today I was swapping out my old stock cat convertors with a new set from Magnaflow. I had all the old parts in a bin and some metal scrap guy came and took the stuff. Well the nuts that attach the cats to the stock manifold were taken too. Now I have no idea what size they were. Can someone tell me so I can go out and get some and this back on the road.

Thanks
 
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3/8" x16 - try Home Depot for some stainless steel nuts. Reassemble with lots of Anti-Seeze (NAPA has it). Then next time you work on the exhaust (yes, you can bet there will be a next time) they will come off easier..