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From what I read, my (M8000) i-spec B shifter should be backwards compatible with my old i-spec A (M675) lever. But I'm not 100% sure.
I think the nut and bolt at the bottom of this pic:
[url= http://www.chainreactioncycles.com/shimano-i-spec-b-bolt-nut-unit/rp-prod141531 ]Nuts and bolts[/url]
are what I need to do it but the shifter didn't come with this nut, just the other bits on that pic.
Anyone know whether I'm missing a part that should've come with the shifter or do I need to buy this surprisingly priced extra?
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B shifter will fit on either brake lever with that kit. A shifter will only fit on an A brake lever.
But isn't M8000 I-Spec II not I-Spec B?
Edit: Seems M8000 comes in both flavours
An aftermarket M8000 iSpec b shifter should have come with the parts you needed. There should be all the parts that you linked to on CRC... or at least the last couple of dozen I bought did anyway.