Wayne,
16-12-553-01 (170N) for both sets.
80 420 uses the same spring in 3rd it's the same part# 16-12-553-01, it's neither Red or Green
86 Auto uses the same sping tension but different part#
16-17-026-01 (170N)
The Auto Manual discription of springs as follows
Red 12kp
Green 8kp
Bare metal or no colour 17kp (i assume 17kp=170N) the heavier the spring the faster it needs to turn to drive.
This applies up to 80 as the manual discription for 84 does not mention colour code
