Thanks for all your help guys. I first compared the springs to my old stock ones and the outer diameter of the spring matches the stock ones perfectly. Next I tried to test fit it and they sit in the perch perfectly as well.
However, the spring height is a tad too high... so I'm going to try and find the spring height of TRD japan springs and match the ones I have to it. Anyone happen to know off the top of their head what the spring height on TRD japans are?
You guys are probably wondering why I'm going this route. The answer is, the springs I have are custom built by Eibach. The spring height, outer diameter and spring rate are all custom. The outer diameter matches perfectly, spring rate is quite stiff but will match my coilovers up front, only thing to do is now match the spring height.
The springs are no use to anyone at the shop, since the customer backed out on them. So I picked up and plan on using them on my AE86.