I will wait for Frankie to answer that.
What i like about the arm, and I considered a few. Its steel, not my favorite but..I would have no qualms about welding to it.. Cant say that about Aluminum, unless willing to heat treat it.. At 150 bux plus shipping 2 ways
And it looks Ok ...pretty nice actually.
Bigger pivot but I can deal with that.. I will cut the front off mine, move pivot back..