I needed 16 of them. It was going to cost over $40 -- BUT -- they don't carry them in the length that I need them -- 3 inches.
I decided to print them on a MakerBot Replicator 3D Printer for less than $0.30 each. I bought the bolts at Home Depot.
Step 1: Design in Inventor -- Then 3D Print!
This was printed using PLA Plastic. It took about 20 minutes to print each one.
You can use any length bolt that you want as long as it is a 1/4" x 20.
I made 16 of them at TechShop. I saved a lot of money and they work great!