Need help Id-ing s13 purple coil springs

[240sx4roadrace]

Hello,
I am building up an s13. I picked up a parts car and it came with a set of lowering springs. I was trying to id them to figure out if I wanted to give them a try. They are powder coated purple, no company name(obviously) and only markings are a what I think are part numbers. I have not found any info using what data I have. The front are big fat stock width with marking SP N021F and the rear are normal rear width with marking SPN 021R. Any help would be appreciated.

Carl

[darens13]

those tenzo springs are purple.