I have one that came from from ebay. Your link didn't work unfortunately. The one I got is a bare bones but it does have the marking on the wires and switch ends, but not the plugs that go into lights, the proper fuse panel that has bulkhead connectors and stuff like that. It is not a problem because I am swapping the older stuff over as time permits and I am not in a huge rush. I feel for the money it is not a bad kit and aside from adding a circuit for the rear window on my K5 and subbing in power seats out of a later model Tahoe it has more than enough for the stuff I need it to do.
I think I paid about 180 for mine and got it from a Keith's Hot Rods off ebay about 2 summers ago after the PO's rat nest had sparks shooting out from under the dash everytime you tried to turn the ignition or light switch on, lol.
I figured it would be safer than burning the thing down after swapping a bunch of go fast parts and a 5.3 LS to it..
the only thing I found was that the manual sucks a little but after taking a closer look at the painless kits I found that they have a 21 circuit kit that uses almost all the same stuff and their instructions have better drawings and actual photos in some of the area's that presented challenge.
If you end up getting it and need a better manual send me a PM and I can email you that pdf file, or print out a good laser color copy and drop it in the mail to you. That way it will not run if you get some water or other liquid on it while working. I tried the electronic copy but it's handy to have something to make notes on when making alterations to the original vehicle configuration.