Sorry to take so long answering the question about the springs. They came from a automotive kit to replace all of the pieces in drum brakes. I had a piece break in one of my rear brakes on my car and had to buy the full kit to get the piece that I needed. No problem, as the whole kit was only about $5. Anyway the springs were in the kit, and already painted yellow.
I found an assortment of springs at Home Depot, but I liked these better and took the Home Depot package back. BTW: they are located in the section where they have hinges and stuff for wooden fence gates. They were hard to find, only one clerk in the store knew where they were.