Nut size question, gasket question?

[97SHOgt]

I need to know the nut size, or whatever I need to know to get the nut for the y-pipe to manifold stud. I was putting them back on and I cannot remember where I put the fourth one. I believe I put it somewhere so I could go to the hardware store and replace them but never got to it and just put the old ones back on (which was stupid but I got impatient), and I really don't want to take one off just for this. Anybody know off the top of there head? Also, do I need a gasket where the y-pipe connects to the rest of the exhaust? When I took it off I didn't notice one, but when I was putting it back on I nocticed some play and a gap and I can't quite seem to get it tight enough. Any help would be great, thanks!

 

[Ishodu]

Gen 1&2 are M10X1.5mm For the exhaust stud nuts. There is a dough nut gasket that goes between the Y-pipe and the cat back. Parts stores should have it in stock, I usually just ask for a 2.25" gasket and I receive the right one.

 

[97SHOgt]

Thanks a lot. Thats just what I needed to know!