cut from AA6-187X2X2-1/2 angle two parts
Drilled 1/8"" hole in the indicated position.
Trimmed to measure.
Drilled 3/16"" holes
Radius all corners 1/8"".
After mounting and matchdrilling the holes are right at the limit to the edge.
After consultation with Lucio Castrogiovanni it seems that the fabrication is acceptable.
As i ordered other angles from VANS i consider to refabricate the brackets.