Do you have a local bolt specialist? Down here ours is called Nuts and Bolts Tasmania < Ashcroft Transmissions > - their name says it all. If you walked in there asked for a M6 x 20mm high tensile your guaranteed to walk out with the right thing and they're prices are cheap.
Alternatively, and possibly better actually, get down to your local Repco Auto Parts/Supercheap Auto and check out their nuts and bolts, they both usually stock the Champion brand of products which are high tensile and they should have flange head ones which are probably better suited for this application.
Yep, use it, just a bit, don't go overboard. Blue should be fine - it's mid-strength I believe.
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