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Cheers man, according to the chart in the little booklet I don't need any for BSA 68mm.
Btw, was about to message you about your polishing man.... how much do you reckon he would charge to do these crank arms?
I was reading up about anodising and learned that the quality of finish depends on what's underneath - it hides nothing - which is why the last ones came out quite rough and ready after being shot-blasted... so anyone wanting an attractive shiny finish would have to polish the surfaces beforehand anyway.
The colour is more dark grey than black so they look slightly out of place on the bike... eventually I might polish them up but for the meantime I'm happy enough.
Silver bolts made a bit of a difference.