Looking to buy a di2 front and rear derailleur and a Shimano R8000 crankset with 170 arms to complete an upcoming build.

Derailleurs: 2x11 speed. r8050 preferred but will consider other compatible models

Crankset: Needs to be 170 arms to match my left arm power meter. Would prefer R8000 model so that it matches the power meter. Chainring size doesn't really matter.