Most modern Shimano cranksets will fit in your BB92 bottom bracket.

The 160 mm crank arm length does not matter. That is an uncommonly short crank arm length, so maybe that is making the search more difficult.

But whether your crankset has a 160 mm arm or a 172.5 mm arm, all your bottom bracket cares about is that it has a 24 mm spindle that slides into its bearings. And all modern Shimano cranksets (10 or 11-speed) do.

In Dura Ace, you're looking for FC-7800, FC-7900, FC-9000, FC-9100 or in Ultegra, FC-6600 and up. The spline is always with the crankset; it is fixed to the driveside arm.