jester
+1y
Ok, not trying to be an ass, but when the link bars are connected to the rear differential, they become joined just as solid as what you have done.
To prevent side to side motion you need a panhard bar connected from the frame to the differential. The name two link is kinda mis-leading, a parallel four-link also needs a panhard bar, (or Watt's link if the funds allow).
I suggest you do a little more research, your work looks good and your prices are fair but you have to make sure you know everything involved when your dealing with suspensions.