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good luck finding grade 8 metric hardware. Common metric ratings are 8.8 and 12.9, the latter being the most used on engine hardware. You can get brand new SR hardware from the nissan dealer most of the time, if it matches a US part number (studs, nuts, yokes) if you know the part numbers, and have it within 2 days even if they have to order it. HD/Lowes metric hardware selection sucks, go to an ACE, or an industrial fastener supply place. Exhaust should be M10x1.25, i'd imagine the intake is M8x1.25
S13 SR (redtop) part numbers.
Intake:
08120-8301F - bolt x6
08223-82810 - stud x2
08911-60800 - nut x2
00915-41500 - washer x2
Exhaust:
08912-8401A - nut
14037-42L02 - yoke
08267-03010 - stud
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