I would like to add J&R springs to the list of satisfactory companies. I ordered springs for the 52 3100 from JC Whitney. They were out of stock. I called JC Whitney and the person there said they got the springs from the aformentioned company. So I called them. They were very helpful, and suggested a number of options. I purchased the front set for 125$ that included shipping. The finish around the eyes was a little rough, but the spring fit like a glove.
