JZ Impulse Responses (gumroad.com)
So I decided to download a few of this guy's profiles based on Metallica and MachineHead albums and when I added them to my GGD 5153 profile these IRs are very close to the albums.
You get a ton of wav files and they are to suit specific units and plugins - Kemper wasnt included but I tried the NDSP wavs with the Kemper and worked really well.
The guy has put a load of free impulse packs up there, but has a list of paid ones which are $5 each. For me it was worth the experiment and would recommend 