If you measure the length of the spring unloaded I can see if it matches up with the specs I have for whiteline springs. I have one that is one digit off your part number but may be a typo. Hopefully it will be a 12 in. length.
This is from my records:
Whiteline No, Spring rate (lb/in), free length (inches) Drop (inches)
Rear 80443: ____155,___________12.0,__________1.3