I usually just go the the LBS when I have some that are too short. They usually have a box full of that kind of stuff and give it to me free or a couple of bucks. You can bolt a couple together to get the length you need. A vise and adjustable wrench/hammer to put needed bends in. You can even bend a 90 over a counter edge depending on the way you need the 90. might need to drill ahole or 2 if prepunched ones don't work out.