Changing hub assemblies today, I noticed this piece broken (broken away at the bottom). What's the name for it so I know what to ask for at the auto parts place?

Always something on this old truck. 98 Blazer FWD.

 

sway bar end links

 

yeah very common. make sure you replace both sides, the other is probably on the verge of breaking

 

Thanks for the help. If it's not one thing, it's another with the Blazer. The engine and transmission are sound, but I swear the previous owner had a mission to hit every pot hole he could find.