Are these RS*R springs for an S13????

[Spring Break '92]

I just got these RS*R race springs for my S13. The part number on the box is correct, but on the labels on each individual spring it says Z33. Not sure if that is denoting the application. It seems like the front coils should be larger in diameter than the rear. I didn't see that 2 were larger in diameter (not by much) until I pulled them apart from each other. I have heard of people running these with AGX's and otherwise stock design struts, it just threw me for a loop when I first looked at them. Someone must have labeled them wrong, because the ones on the left in my pic are only going to fit on the front struts yet are labeled 'R'. The ones on the right are labeled 'F'. I only assume that means rear and front respectively. Are these the correct springs? I emailed RS*R and have not heard back yet.