You can probably have a shift lever anywhere along that shaft you would like. At the worst the H pattern may be reversed so that (for example) low might be to the right and back rather than to the left and back. This seems like a big deal at first, but a few laps around the block and you forget that it is different.

 

Drill a horizontal 1/4" hole through the shaft anywhere you want a lever. Build a lever from 1" flat stock folded into a inverted "U" shape so as to fit over the hole in the shaft. Drill a a matching 1/4" hole through the strap stock. Weld on a bolt sticking up to screw your shift ball onto. Leave one leg of the "U" shape 3" longer than

the other and add a couple of 1/4" holes in a vertical plane. These holes will get one bolt for the pivot link so as to be adjustable. Construct a pivot link of small tube stock with a 1/4" nut welded to each end. Screw in a 1/4" rod end and jam nut on each end. One end bolts to the trans about in line with the stock shaft. Forward of the lever or to the rear of the lever makes no difference. The other end bolts to the longer strap below the shaft. Double nut the shaft bolt to adjust clamping force for good feel.

 

There is another system that works well. I can draw up both if you like.    Shift up a storm.

 

Lynn E. Hanover