When I bought my 2001, the driver's window regulator was broken, so it was one of the first things I fixed. In my case, it turned out to be just those parts you showed in the photo that needed replacing, but I got a complete regulator assembly for about $30 on Amazon, so I went that route.

All the pre-emptive repair + maintenance sound good. Those regulator clips are generally a composite of metal (appears to be pot metal) and plastic (nylon?). The OE ones vs. the various aftermarket vendors (BMW does not sell those separately) have varying designs of what is metal vs. plastic. The ones you show in the photo, I expect are 3-D printed. They may have a different failure mode than the OE ones you're taking out, so different reinforcement may be necessary. ???

So here's some advice that may help...

When I did mine, I correctly assumed that there would be a lot of missing/broken little parts. So I bought several of the plastic clips that hold the inside door panel to the door frame (brittle with age + snap when removing). There are two different types - one with a foam gasket, one without. I bought several of both - cost is minimal.

Unexpectedly, when I took the panel off, I found that the foam vapor barrier was GONE. So I bought a new one of those.

New window clips, as you've bought, but I also bought new screws, etc. Obviously with the vapor barrier gone, someone else had been in there before and I did not know what he may have left me with, and given that BMW obviously has its summer interns handle regulator design throughout its product line, I did not want to further cut any corners by using a "close-enough" screw that I might have in the garage.

Also, on taping up the window, as I recall, checking the Bentley shows to roll the window down a certain distance (like 140mm or something) before taping it stopped and disconnecting the battery. I think that specific position allows access through the door frame to the regulator screws, so you won't need to re-connect the battery and window control to drive the window up/down mid-way through the repair to get those last two screws. Why would one care? Well, if you need to turn power back on, etc. a few times, it is more likely that you'll forget to reconnect the airbag when turning on the power. This will set your SRS light, requiring a reset later with the special tool. That was not a concern for me, since the PO did not know this, and my SRS light was on anyway and I had to buy the tool to fix that. But if you don't have a reset tool, either be cautious on this, or figure out the 140mm distance, or whatever it is.

I think it you are careful to never reconnect power (not just turn the key to on; I mean connect the battery) with the airbag disconnected, you can avoid problems with the SRS light. But if you DO, you will need special equipment to reset it.

Here are the parts I used (2001 x5 3.0i, left front window):
51-33-8-254-911 front left window regulator
51-48-8-402-389 front left vapor/sound barrier
07-14-7-154-229 hex bolt
51-33-8-242-760 bushing
51-41-8-224-768 door panel clip with foam washer
51-41-1-973-500 door panel clip
51-33-8-254-781 clip

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2001 X5 3.0i, 203k miles, AT, owned since 2014