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I would highly recommend you reach out to Odin Works to trouble shoot your issue because these springs are meant specifically for carbine length buffer tubes or rifle length buffer tubes. The buffer tube on the Zulu stock is a proprietary "Intermediate Buffer Tube" which means you will likely run into a slew of issues because the Zulu also runs its own proprietary "secondary buffer system".
The Zulu comes with an extra screw for the recoil arrestor. Take the plug out of the back of the buffer tube, you’ll see a spring and weight attached to the plug. Compress the weight and use an Allen key to remove the screw. After the screw is out take the spring off and use the shorter screw to secure the weight on the plug without the spring in the assembly. Screw the plug/weight back into the buffer tube. If your Stealth is loose in the tube, you can add a washer between it and the plug/weight to act as a spacer.
Remove the second buffer system but leave the plug or spring, not sure, fits perfectly after that.
I have the Zulu 2. 0. The buffer inside is designed to work with a standard buffer and spring. I have a fancy oil filled buffer (hydronic) and it becomes a redundancy. I imagine this system would function similarly. I removed the secondary buffer as explained completely-
Magically I’m running a subsonic 300 setup (7.5 inch barrel and pistol gas system) with just a cookie cutter. It’s one of my best running AR’s in the house.