This will be the single best investment you make... My life changed when I did, instead of losing hours hunting down bolts adhoc I now just keep inventory of everything.
I couldn't find any premade assortments with bolts I trusted. Run as fast as you can from the Chinese crap on Amazon. Most are not marked with grades, the ones that are have reviews questioning the accuracy of those ratings.
I ended up buying every length of M6 and M8 bolt, nut, and washer from boltdepot.com. JIS 10.9 spec on all of them. I also purchased the gray metal storage boxes. I forget who makes them ATM. Durham?
As a result I now replace every OEM one once I touch it. Getting those 10 year bolts out with new JIS STD ones is so much nicer.
Let me know what you come up with.
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2006 Lotus Exige: Avery Matte Graphite wrap, partial built motor (9:1 Mahle pistons, Ferrea Competition valves, ACT Clutch, ARP head studs), REV400, Nitron SAs, BOE QS exhaust, Ultradisc rotors, Moroso Oil pan, Circuitworks oil pump, CF Stuff (Cup Roof, ReVerie diffusor, side scoops, APR air dam, craftsquare mirrors), Worksbell quick release, Odyssey PC625, Morimoto Xenon HID, BOE Rear Oil Cooler, Difflow Aeroplates, BOE Swirl Pot, DaviesCraig EWP, Reversed Heater Matrix