Fwiw- I tried axles from advanced auto and couldn't even get them to slide in. The splines on the cheap axles are often real bad. You might get lucky. I didn't want to go back and forth so bought GKN axles which are the original part maker (I paid around $280 each).

It is a pretty standard procedure to replace them on the X5 - I think any shop could do it.

I'd be looking for an estimate around 3 hours to do both sides plus parts (maybe you supply...). There's a guy here who posted a video rebooting one (which I think is harder) in 30 minutes...so it's definitely possible to do it faster if you have a good plan before you start.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles