Tim, I was leaning towards the same concept. That the bottom springs are for a 3/4 ton. Because that's the only U-Bolt I could find besides the 1/2 ton. I don't make things often. Spent 36 years as a Electrician
Dave thanks for the confirmation.
Ron, If you'd like the springs, and brackets that attacked to the Frame. I can send them to you. This is of course minus the U-Bolts that will be cut.
I drove little British Cars all thru High School. The one I wish had not gotten away was a Right hand Drive TR4A I got a hold of my Senior Year.
