My first time tackling this job myself: replacing all four sway bar endlinks on the Miata, front and rear. The old ones had seen better days — cracked boots, more play than I'd like, and the kind of clunk over bumps that makes you assume something worse is wrong before you actually look underneath.
Parts used
Whiteline Ball Joint Sway Bar Endlinks 90mm-115mm (2x)
— 61-10496
Good-Win Racing
What I figured would be a quick job turned into most of an afternoon — wrong socket, a seized bolt, and more time spent looking things up than actually turning wrenches. But the clunk's gone, and I came away knowing a lot more about the suspension than I expected to.