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These are the nuts that are used to Bolt the Exhaust manifold to the head, and in a TD42 motor they are used to mount the Turbo to the Manifold.
The studs and Nuts get affected by the amount of heat around the turbo manifolds- we recommend replacing them when you have the manifold off- as its a very painful exercise to have the nuts come loose after a short period or have the studs snap as you are tensioning them up.
Depending on the engine there is a Different Qty Required
TD42 x 12 For Head, x4 for turbo to manifold
TB42, TB45, TB48 x 12 For Head
ZD30 x8 For head
the Thread on these is M10x1.25
Total width of flange is 21.5mm - in some applications this could foul
We also sell the Studs separately or in kit form for different models of vehicle- so search our other listings for these kits