Hopefully the attached three pages will be of use to you, although they do not show the actual spring rates, only the colour codes.
They were taken from the VAG ‘Workshop Manual – Golf, Jetta, Scirocco – Running Gear’, May 1985 Edition which superseded the March 1979 Edition.
A Bulletin at the back states that on the 16v, the front coil springs are shorter and stiffer, and due to this the front of the car is approximately 10mm lower.
Colour Code either 1 x Grey or 2 x Grey – Part Number 533 411 105.
The shock absorbers on the 16v have a different characteristic and are stiffer -Part Number 533 413 031.
Rear coil springs on the 16v are unchanged.
Colour Code 3 x Yellow – Part Number 531 511 105 A.
The shock absorbers on the 16v have a different characteristic and are stiffer -Part Number 533 513 033.
Thanks to Pete GLi
All rights reside with the author, post for instructional use only