I bought these particular ones because most of what I read online said they were the best 
I've had 6 different KX's going back to 1984, every one of them since '87 has been SO reliable. I had a lot of issues with my '84 KX's frame. I've always used OEM kawasaki replacement parts, not one single issue. Kawasaki makes excellent bikes period !
My only comment to your spoke issue is if Buchannan spokes are such "top quality" then why are you going through all these non-fitment issues ? Sorry to come across like i'm busting your balls, but in the future just use OEM Kawasaki, slap the part in, it will fit perfect, and perform perfect.... just something to think about...
Just some FYI, I went to the Buchanan website, and the website describes a single length 36 spoke kit "KMX707##" for ALL 1986-2010 KX 125/250/500 19" wheels ... so who ever sent you two different length spoke kits screwed something up in the process...
