That's correct, there is only one type of pre-compression spring. Most of the time you'll use the dark coloured ones which from memory are 5.5, 6.0, and 6.5 coils. The more the coils the softer the spring.
The silver ones are very stiff which might be used on some very smooth tracks but arent used very often.
We have the spring kits in stock if that helps
cheers
kev
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