I'd like to set up a Surly Straggler 2 x 11 Rival 22: with a DT Swiss 350 disc hub (135 spacing, Q.R.) to work with a SRAM 11 speed road cassette.

I see that DT Swiss makes (1)a steel freehub for 11 speed, and also (2) an 11 speed aluminum that comes with a new drive side endcap.

Since the steel freehub comes with no end cap, can I use that alone with the stock endcaps?

The hub I have is a stock J bend spoke 350 disc 135mm 9mm q.r version.

Thanks for any insight.