The stock bolts are M5 X 10mm. I replaced them with aluminium alloy silver anodized items. The M5 washer proved too small so I used an M6 washer but alas did not have any M6 silver anodized ones left. Used regular potassium bichromate plated versions. Gold and silver never looked better! Pix below.
Thinking of getting Nismo fuel cap garnish but that will add more weight :( Also replaced the bolts holding the boot lid hinge with aluminium items. Stock crappy bolts..
Pro-Bolt M6 X 40mm aluminium alloy silver anodized bolts installed.
Ordered bolts 5mm shorter than stock. Don't know why the stock bolts need to be so long. There are loads of thread still left once the 40mm aluminium bolt has been fully tightened.