Dr Diff Offest Kit With Oval Track Springs

Anyone have experience with these ?

Not sure if this picture is of the actual spring, but they have 4 leaves,and look similar to the oval tracks.

View attachment 1715250874

I have them sitting in my garage. They are not installed.

I currently have Hotchkis springs on my '68 Dart and since my car weighs 3500 lbs with a full tank of gas, my wheels rubs when I have a heavy passenger and/or a bunch of car show stuff in the trunk.