Where to buy H&R springs?

I brought my 40/40 direct from h&r through a local garage after ktec stop selling them a few years ago.
 
Is there an actual handling Improvement by fitting these on 200 Cup suspension?

Is is the ride stiffer or softer?
 
I emailed ktec last month when I was looking into theyre 30mm springs and asked for the item number to compare it to the larkspeed 30 40 kit. They replied that to their knowledge h&r only make one kit for the 197 and the 30mm kit is for the 200. Mine arrived from larkspeed with a euro car parts sticker on the box?
 
Is there an actual handling Improvement by fitting these on 200 Cup suspension?

Is is the ride stiffer or softer?

Good question. Been trying to establish this for the Cooksport springs too as the spring rates differ between the 197 / 200 non sup / 200 cup and more interested in reducing lean a little on track over the cup springs whilst still having a drive able road car, without the need for expensive adjustable coilovers which I wouldn't know how to set up anyhow!