I have a set of rear King springs that I'm considering purchasing fronts for, in order to be put to KYB AGX adjustables once my bank balance allows it

However I'm not sure what exactly I have so was looking forward to some help in identifying them.
The box just says Performance Replacement King Springs. The code on the spring says KMRL-53. From the online catalogue on the website it says that they are L (I'm assuming Lows)

- Anyone have these installed?
- How much height drop do they give?
- Are they suitable for KYB AGX adjustables?
- Most importantly....should I use them? Or should I go for some of the Pro Sport Competition Coil Springs instead, which are progressive?
Cheers guys. Wouldn't be making the right choices without the forum and your input
