I was looking at the QA1 site, and all the Heim joint options... Yummy.
Building a set would be about as much as buyng the 170.00 ones. However, by the time you buy the full setup for the rear suspension, your about 700.00 into this deal. (But have complete adjustability for the rear suspension, and heim joints at all bushings except for the stock rubber mounted ones in the rear knuckles/hubs.)
From what I can see in the D1 world, these alloy links/bars are very robust. They slide around for a season or longer on them, and usually nothing breaks. Better than stock, and lighter by far too. Plus the gold alloy rods do look pretty nice under there. LOL