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Where, if at all, can I get an M780 left hand shifter bar mount? It's currently an ispec and my new Deore 4-pots are not...
I have converted this to be my dropper lever, I'd rather not buy another LH shifter.
Currently it looks like this.

Try SJS Cycles. They stock loads of Shimano spares and parts.
Although not in stock at the moment.
From what I can make out from Shimanotechdocs (check yourself to be sure), it's part no. 6UV98080, in stock at Madison, so available from just about any shop, and coming in at£3.99
Just checked Madison stock and they have them (part code 6UV 9805) so any bike shop with a Madison account could get you one. All Shimano is post free so can get it without making up an order.
That part doesn't include the clamp Coatsey. It's a blanking plate by the look of it, hence being so cheap. The band and associated parts are £15.99 which is much more Shimano spares pricing.
Hmm, looking like another second hand left hand shifter bodge is the answer.
I'm off to recykabike...