I ain't sure the doohickey needs replacement on 2008 and later KLR650's.
While I realize the notion that the revised idler shaft lever is a durable and reliable part is controversial, threatening belief systems, suggesting heresy and perhaps blasphemy, here's my rationale:
I know of no latter-day doohickey failure in five years of production (2008-2012). Apparently, this "ticking time bomb" ticks for a long time, and--very slowly!
Spring tension? A separate issue from the doohickey (my distinction).
Granted, the OEM doohickey's shaft fit isn't as tight as the aftermarket model's, but . . . what's the consequence? Any catastrophic failures traceable to the shaft fit?
Your bike; replace the doohickey if the Internet admonitions appear compelling to you, but . . . I know of no catastrophic doohickey-related failures since the 2008 models (although one "cracked" late-model doohickey is said to exist).
Again, spring tension bears watching, but . . . maybe, just maybe, with five years of maintenance history without failures, the revised doohickey appears reliable and durable.