I bought 2 new carriage bolts this morning and installed them with the shackle holes now closer to the frame instead of the spring. The clearance is close, but it looks like it will be okay. Will need to keep an eye on it to make sure it doesn’t get worse with a load in the bed. If it doesn’t work, then I will have to try the style that has no carriage bolt in the center.
To answer Mike B, the spring ends use 2 different type of pivot pins that cannot interchange, and I didn’t try it, but I think that if you try to install the spring backwards, the center pin hole won’t line up if the front pin is installed. Or vise versa.
