My wee came with the aux shelf with powerlet and cigarette sockets. I just wired my tank bag from powerlet to sae. I went the cheap route and bought the sae outlet for$5 from an online RV solar place. It doesn't come with the backing plat, nuts and bolts the powerlet one comes with, but the socket is identical. I made my own backing plate from a large washer and sought some stainless nuts and bolts. Inside the bag I wired a sae splitter then took a cheap cigarett to dual USB adapter, opened it up and wired in a SAE plug.
I'll try to post up some pictures