Hi Kratos,
What are you calling the bottom links? Do you mean the latches? I wasn't aware of any problems at all with these units, but the truth is that you could probably buy 50 of these hitches and no two of them would be the same dimension between the legs even though they are fabricated on a jig.
A lot can happen between here and China; containers bumped, etc. (Take it from me).
Correct me if I'm wrong, but I believe the AGMA standard for category 1 hitches is 27" inside face between the legs or 28-1/4" OC. I found that I had to "adjust" my legs about 1" total (1/2"/side) with a port-a-power to get the correct measurement, and I found it necessary to fabricate adapters to make the LW-6 BH compatible with the rest of the world. If anyone is interested, I can post the drawing and photos.