So no IR parts are showing up for me in the spawn menu. There is a category for them, but it doesn't contain anything. I am using IR v2.0.3 and KSP v1.1.2.1260. Screenshot was taken in Sandbox mode.
http://i.imgur.com/iFt1JiK.jpg
Just though I'd add that I just tried installing the IR legacy parts, and those parts do show up.
http://i.imgur.com/WgkWeCM.jpg