Post up a picture of what you’d like your project to look like. We can tell you how to get there. These transverse springs are leaf springs for sure but you’ll need to not apply almost everything you already know about leaf springs when working with them. They mount with pretension and there is a balance between compression from weight and that pretension. The results of being balanced is 45* shackle angles. soooooo very different. As alchemy brought up, none of the manufacturers seems to publish their springs arch height. It makes a huge difference on final ride height. The eye to eye is one thing and really not enough. For instance I can build 4 springs each with 31” eye to eye and that’s all I’m going to mention. I’ll just keep this info to myself but spring 1 has a main leaf length of 34” spring 2 main leaf is 38” spring 3 is 48” and spring #4 has a main leaf length of 27 miles all with 31” eye to eye and me telling you that is bullshit. Then we have posters submissions of pictures with shit so jacked up but they also neglect to include any particular venders or part numbers.