I have a Shimano 5700 crank that's 50-34 and 172.5 crank length if you are interested. No reason you couldn't use them with 11 speed even though they are from the year before. It has never been ridden.

Greg

I have a BNIB Ultegra 6800 crankset 165 mm 50/34. $250 shipped.

Make that an Ultegra 6800 165 mm 50/34 or 53/39 both brand new in their original boxes. I can sell either to you for $180 PayPal gift + shipping.

I have a FD, 9-spd Ultegra.

I've used it with 10-spd. no problems, and it should also work with 11 (a double crank is a double crank).

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ECMGN Therapy Silicon Valley:
Depression, Neurocognitive problems, Dementias (Testing and Evaluation), Trauma and PTSD, Traumatic Brain Injury (TBI)

I have everything on your list. PM me a price