I checked it out and now I see what you are saying. I did your homework for you so here it goes.

There are two part numbers for the arc and lateral control arms for left and right side.

Part #k90265 is the passenger right side lateral arm and part # k90266 is driver left side lateral arm. Part # k80436 is the right passenger arc lower control arm and part # k80437 is the left driver side arc lower control arm.

I found this information on moog's site as well as advance auto. On advance site if you click on the part from the listing it will tell you left or right side except for the lateral arm which didn't have info. That's when I found the lateral part numbers from moog's site.

Now you can buy me a beer. :beer