Looking for coil spring info - been searching for a while...

I have some coilovers that I purchased from realtruck about 6 years ago. They are Eiback coils and I have somewhat of a part number left on one of them. 1400.300.600S. I believe the stock coil for the 4x4 1st gen tacoma is similar in length. So 14", 3" inner spring diameter with 600lb. Load capacity on the spring. One of my springs broke right at the top. I am having the hardest time getting info for a coil replacement. I will replace both coils springs and utilize the adjustment sleeve and Bilstein 5100 that came with my original kit. This was my original kit. https://realtruck.com/p/toytec-toyota-coilover-shocks/.

The kit is no longer available and realtruck doesn't know what the part number or what kind of coil spring was with this kit. I am not having any luck with messages to Toytec as well.

I don't want to spend $800 on new coilovers as I just replaced all my rear suspension with OME stuff.

I am thinking a 550 coil as I have stock front bumper and nothing added but what I am curious about is the relaxed length. With the adjustable coilover would I use 14"? 16"? I have about 25" from center of hub to fender on the rear. Right now ( with the broken coil to boot) I have 23" from center of hub to fender. I have a diff drop and this height seems just right. When I measure the threads on the bottom of the adjustable coilover I have exactly 1-15/16" (so right under 2").

Lots of info out there but it's quite the mix of info. Trust me - I have been obsessing for a week or more and scouring TW. I think I know what I need - but not sure. I do know that the coils I need will have to be flat on the bottom at least to sit on my adjustment sleeve.