[Hanuman]

The same place that produced the uprated coils for the ur have the specs to be able to run off a set. Assuming that they’re still in business.
An original, but obviously used, set of coils was used to create the benchmark for the uprate.

The uprated versions made for a group buy came in two versions, iirc. 25%, or 30% uprate, but intending to retain standard ride height. A small oversight saw the free length of the springs not being set properly, resulting in loose springs on assembly until there was weight on wheels. That could easily have been corrected.

I do have a full set of original coils (1985 WR, non-a/c) sitting around from when I did my suspension rebuild. They’re surplus, but as I’m not in the country at present or for a while, they may be of little use to you. They’re also in need of properly cleaning up, and painting.