Seeing you are in GB I can suggest two avenues possibly more convenient than buying in the US:
Hessler RT Online-Shop Stefan Hessler is a DR expert. I bought a heavier spring from him and are very happy with it. He asked me for my weight and that of my luggage ans supplied a spring to suit. The original spring would bottom out on French back roads without a pillion or luggage. However, I also think that the damping is way too soft for road use, although I don't mind.
The other option is HyperPro in Holland. We visited them 3 years ago and they re-worked the suspension of my then gf's DR, using their springs front and rear, re-shimming the forks and shock and changing the oil viscosity. It was too stiff for my liking, but she really likes it. They have a web site and they also make complete shocks.
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