I used the ARB Differential Breather Kit for this modification. I bought it from Amazon.
Amazon.com: ARB 170112 Differential Axle Breather: Automotive
The kit includes a filter, 4 two-way breather fittings with Teflon tape already on the threads, 3 plugs for any unused breather fittings in the filter, lots of zip ties and enough tube to do multiple breather modifications.
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2015 SR5 Premium 4wd Magnetic Grey w/3rd row: Frontrunner Slimline II 3/4 Rack - Yakima Skybox 16 - Weathertech - 22" Behind Grill Light Bar - TRD Skid w/Full Aluminum RCI Skids - RCI Sliders - Falken AT3 265 SL - Lamin-X - Taxa Cricket
"If I Can Do it You Can" Light Bar Install
ARB Breather Mod
Cymon's Weekend Warrior/MFD Thread