Making it. Flattened OE arm and tacked it to a piece a 1" flat steel. Cut out splines with a 2 1/4" hole saw. Marked hole for drag link, outlined it allowing for some more meat, separated them, and cut the hole for spline piece out of the new flat stock. Notched the blind splines with a pipe saw to allow 180 degrees of adjustment. Cut the two angles on the cold saw and notched the corners off to have less grinding to round the them off. Ground angles in the new piece to stack welds, slid in the splined piece, and tacked it.
Bulletproof Steering told me it was my only option. No body makes a custom flat for us Ford guys. There are a couple that come close but I needed to run a 1 ton Chevy BJ drag link from Ballistic Fab so my hand were tied. But for drops, 180 splined, and other options Bulletproof Steering has a lot of knowledge and options. Just not flat this is the only way.