Gidday from Lamplighter, what tool do I use to remove derby cover bolts on a 2006 sportster 1200 custom, the heads look different to anything I've seen.What size are these as I intend to replace them with chrome spike bolts x6, anyone know where I can buy these for my sportster? The bolt size board at bunnings worked perfectly to size my air cleaner insert bolts, thanks again for the tip, cheers.