[quote=&quot;John Schwiebert&quot;:hc2tf7b1]Now by dumb luck I just looked in my parts book. The 66 used the LS 2100 bracket. Reason your bracket might be factory:  The Fleetline 66  tractors used a 2-1/2 inch cylinder while the Super 66 used a 3 inch cylinder. The formed piece of metal may be the same and the two pieces were added to hold the smaller cylinder. The Super 66 &amp; 660 as well as all the 6 cylinder row crop tractors used the KS 2100 bracket which is for 3 inch cylinders.[/quote:hc2tf7b1]

Ah that makes sense.  I do admit that the welds, the placement of the pieces, and how square they are makes me think that this wasn't just a farmer jimmy-rig deal.