Minor lowering: Only change springs?

[SpaceYam]

I got a reply from John who is selling those springs:

Hi David,
Shipping via registered post would be $18.80.
How many ks has she done ,because shocks need to be considered as well.
firstly as the shocks are usually, depending on driving conditions,only last 60,000k
secondly you are fitting new sports style springs ,and they require a faster shock to control their new rate,
Cheers john