Rusty Chrome Bolts - Where To Buy Replacements

I bought a carrera road bike last year, a few of the cap screws that secure the handle bar have a little rust and its spoils the look of the bike a bit. I also bought a second hand giant hybrid last year for my kid, several of the chrome screws and bolts are rusty. Where is a good place to buy replacements and can you buy chrome bolts that wont rust or is it best to go for stainless steel ones?? 8) 8) 8)
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http://www.ebay.co.uk/itm/M5-X-20-S-STAINLESS-STEEL-CAPHEAD-SCREW-BOLTS-SOCKET-CAP-CAPS-10-PACK-/300678255841?pt=UK_DIY_Material_Nails_Fixing_MJ&hash=item4601d214e1
Stainless steel
typically you will want A2 stainless socket head cap screws (that would be aircraft grade with rolled threads)
but most are M4,M5 & M6 with a length of 30mm or there about.......
http://proviationshop.co.uk/shop/articl ... rosol.html
Specialized Secteur
which would be a problem if any of the bolts actually *need* to be that strength (or higher)
won't be an issue for something like a top cap bolt, but for the bolts holding the stem to steerer for instance, personally i'd check carefully before substituting
handy info...
http://www.westfieldfasteners.co.uk/Ref ... _Spec.html
Screwfix would be an option if i did not have to pay for postage and i rarely buy anything from screwfix these days.
all the screws are m5 and m6 just needing a few different lengths.