exhaust lock nuts

[charofire]

I am helping my buddy with his exhaust, and I was looking on pelicanparts. They list 8mm and 10mm exhaust lock nuts. His car has no exhaust on it right now, so I have nothing to match. Any suggestion between the 2 options?

 

[sfdon]

12 of the 8mm

Part Number

11621711954


O.E.M.
8mm Copper Nut; Exhaust Manifold to Cylinder Head
Please verify 8mm exhaust bolt/stud prior to ordering, this nut takes 12mm wrench on hex. Special malleable design limits torque for proper sealing, not recommended for reuse once torqued in place. May vary in appearance from original 8mm design.

$0.95

And 6 of the 10mm


18301737774


O.E.M.
Copper Lock Nut; Exhaust Manifold Outlet; 10mm
For models with 10mm bolt/stud