Mr Gasket Verti Gate A-body shift rods and Mount.

When I made mine at Ace hardware I cheated and used my cheap h/f welder to save money and not buy another expensive hem joint. At one end of the all thread I welded tabs to put a small bolt through. A couple more hemp joints to screw on the other end would have probably just cost me another 30 or $40..
I'm sure I could have and still may get stock linkage but I've been running this homemade stuff for about 3 years and had a really nice drive with it yesterday. You can never beat that second to third shift with a V- gate....
Really this should be fab-work 101. Cut that piece of cardboard out for the bracket and get a piece of quarter inch steel and cut that out and center punch the five holes and drill them. Once the shifter is mounted it's a simple measurement from point A to point B and 45 minutes at Ace Hardware putting together couplers and such and maybe having to cut down a piece of all thread.
I can get up under my car and take more pictures and I could probably even give you pre measurements of both lengths of rods eye hole to eye hole? As I recall I was able to use the adjuster part of a regular shift rod set, and couple it on to all thread to a hem joint to the ear on the trans. (But like I said I cheaped out and welded tabs to the other end of the all thread instead of a hem joint to the transmission ear.)