This listing is for ONE (1) single 'Short' head bolt found in all VG30DE(TT) Z32's. There are 2 of these bolts used on a VG30, 1 per cylinder head. Z1 offers a full set of replacement head bolts sold as a kit, available HERE.
Z1 Recommends replacing aged head bolts with new OEM Head Bolts in light to moderate builds.
Please make note of the location of the Short Head Bolts in the picture below indicated by the RED dots.