I have a 2003 Disco II with a 2” Old Man Emu lift. Now that the angles are different from stock, should I replace the sway bar connects? And to what?, brake lines? Anything else?

 

Sway bars and brake lines should be fine with a 2" lift unless you really need to change them.
I changed my brake lines to the extended lines just because I wanted to.
Some Disco 2 owners install Disco 3 front sway bar links on the front and Disco 2 fronts links on the rear.

 

Brake lines sb replaced anyway for pm if they're original. Save yourself from brake problems in future. Might as well get extended ones. While you're at it, do calipers and fluid flush. Gotta bleed system anyway and original parts are over due for replacement by now. The cool thing about your truck is the traction control but it can't work if your brakes aren't in good condition. Your lift won't amount to much more than 1.5" once settled so not much else is needed.