Well, that is an interesting question. Those are the Depo brand AMG replica corners (based on the reflective paint and plug) it looks like. I have a pair and they look just like that. They are great replicas, though they are a slightly different color than the AMG corners if we're being super accurate. One corner Ebay
is currently $30 shipped from Latvia. I believe these used to sell for $50-60 for a pair.
The reason I say its interesting is that I have not seen a right corner, or the pairs, listed for a while now. So, I am not sure how hard they are to find anymore.
If you have a pair to sell, let me know, I have been looking for a pair
Edit: Confirmed I paid $48.98 in 2017.