A source for the sort of items you are considering---not often thought of by 'our' end of hot-rodding---is to look to those who provide parts for circle-track.
Crunching of suspension components is so common that A-arms are thought-of as throw-aways. They're available in a plethora of dimensions and, due to their expected life-times, are quite inexpensive. And they're both strong and lightweight.
From the same sort of source you'll be able to find sway-bars that make use of bolt-on end-arms in various configurations and lengths. The bars, themselves, are of various lengths and diameters and are even available gun-drilled.
KS