

First goto your local steel shop and purchase 16" of bar stock, 1/4 x 16 for a pair of them.
Drill a 1/2in hole close to one end and attach it to the tractor, then slide the 3 point piece onto the bar and mark it for a 3/8 in hole for the bolt. I used a grade 8 bolt.
You can move it wherever you like before marking it. Multiple holes can be marked if you like. I just drilled one.
A lot cheaper than $100.
If the pictures aren't big enough I can do some more using my camera rather than my phone.