It’s so cool you have special access, I’m not sure what you would have done without it.
From @theluthier ‘s image above:

A.. This shows the top arm(s) are attached to the bucket either side of the one longer piece of the bucket, and the lower arm attached between both the longer and shorter parts. Which suggest they are not perfectly aligned as first thought and off towards the inner side of the lower arm.
and B..
It also sits on the outside of the main loader arm
Sorry to throw another spanner in the works. This suggests it’s on the inside…. Which would make sense if the top arm is more to the inner side of the lower arm.