It's an SYE kit and I got mine from Tom Woods. It was a pretty easy install and I'm happy with it. Got a nice driveshaft with it too.
http://www.4xshaft.com/SYE/208TransferCaseGMDesign-32Spline.html
The TW kit doesn't require that either, but the OP wants to make the kit himself to save on shipping to and core shipping from his house. If you do it yourself, be warned it's hard steel. Also, eBay sells the flange if you need one.There is another kit from driveshaftsuperstore.com that requires no cutting of the shaft.