i know it sucks, but that shaft was the best investment i've made even though its the only tresrey part i've bought. just made things easier.
if you think you've wasted money on rw spurs, the first couple times you ream out the center and its slightly off and then you start chewing up spur gears again, you'll be pissed.
i'd either search high and low for the durango spurs through all the vendors possible or you can try reaming. I did an ae spur and bored out the center and you could tell it was slightly off. even taking my time. slipper pad shows the offcenter based on how much is showing on each side of the plate.
sucks you had bad luck, and maybe its because i'm running stock motor in the truck, but my 75 in it is lasting great.