I have used both Auto-zone kits and Dealer kits. I've found that the OEM boots seem to last longer, especially out here in the AZ heat. They are thicker and generally tougher. At this point, OEM is all I'll use as the Auto-zone ones have burned me too many times.
If you search my name, I have a TON of OEM CV boots for sale at reasonable cost. Find the one you need on my list and send me an offer.
As for the "kit", I dunno if you need to whole kit. Usually I use the OEM boot and then a high grade CV grease and a couple of the "metal zip-ties" to install. I get the grease and zip-tie parts at any local hardware store and have had no problems with them. The OEM bands work great too, but are more difficult to install.