Just shipped one out yesterday. I seriously doubt that you will find an off the shelf unit that fits right.
I don't think that you can get a 5" stroke cylinder off the shelf, so you will need to make some compromises with either a 4" or 6" stroke cylinder if you are going to build one yourself. Any of these will provide an equal amount of tilt angle to both sides if built properly.
I think that I would forgo the top pin location in the clevis and use a 6" stroke cylinder.
I use 2 1/2" dia cylinders with a 1 1/2" dia rods for these tractors.
You need a narrow cat 1 top link ball swivel and build the clevis accordingly.
Or you could simply order one from me, just be ready to wait.