So looking back at this with the idea of a 9" spring being the actual correct length ( good call, Tom), I found that QA1 sells what they call a High Travel spring:
"Available in 7, 9, 10, 12, 14 and 16 lengths, QA1 offers an assortment of high travel springs with a silver powder coated finish. Made in the USA, these 2 ½ I.D. high travel springs are manufactured from specially designed high-tensile, chrome silicon alloy spring wire, which allows them to have fewer coils and a smaller wire diameter. As a result, these springs are lighter and have increased travel due to the larger distance between the coils. These lighter springs reduce unsprung weight and react faster, optimizing suspension performance.
In addition, this high-grade material, along with careful heat-treating and post-processing, allows for greatly improved fatigue life, and the coil design allows the springs to be compressed to coil-bind without affecting spring rate or free height.
These new high travel springs are silver powder coated and ground at both ends for straight, consistent and accurate operations. In addition, all QA1 springs are lifetime guaranteed to remain within 2% of the original free height and rate under normal operating conditions."
Eibach's have a total travel of 5.2". So, take a 9" spring and compress it to 8" and you have 4.2" of travel left before you reach coil bind. Activate the available 5/8" ( 0.625") of preload available with the stock clicker, and you are looking at roughly 3.5" of spring travel available...hmm, seems tight. The closer/ more often you operate towards coil bind, the quicker you reach the fatigue life of the spring.
I feel like the QA1 High Travel springs might be a better choice for the KLR. They won't operate as close to coil bind, they should be lighter ( always a plus with the KLR in mind), they are guaranteed for life ...oh, and they are $10 cheaper!
Since I have the lathe handy I am able to make my own spacers to correctly fit the QA1 2.5" spring at no extra cost, otherwise I would probably go with the Eiback for direct bolt-on goodness.
I am unable to find actual product weights to compare, and I'm not able to find a spec from QA1 saying what the compressed/coil bind height of their 9" High Travel spring is. Gonna shoot 'em an email and see what they say.
Eibach: Part# 09002250400 (9", 2.25"I.D., 400 lb/in) spring = 2.98lbs (5.2" travel)
a 350 lb/in spring = 2.98 lbs (travel drops to 5.15")
a 450 lb/in spring = 3.35 lbs (travel drops to 4.98")
Still waiting on word back from QA1