OK folks I need to add a disclaimer here regarding spindles.
I still stand by my statements that they are all pretty much the same an get them from whoever has the best price. However....
When they come in, check them out very well. I bought a set off ebay on a closeout sale for my 99 (gmt400) dually. I had them on the shelf nearly a year before installing them. The axle stub shaft is incorrectly machined an I've been waiting 2 weeks now on a solution. The inner wheel bearing an seal area is .6 to .7mm to large. The bearing an seal won't fit. Everything else seems correct an they are even bolted up to the truck before I discovered that. Never had this issue before an all I can think is the cheaper spindles just don't get the same QC checks. So if you buy cheaper ones just make sure everything is machined right when they come in so that you don't get caught by this like I did.
Some pictures of the drop spindles and measurements:
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