haven't seen this black 'clip'. Does it fail often? I can check my manufacturers in Europe if they make it (and if demand justifies, keep them on the shelf).

Window clips: it is not a bimmer or X5 specific issues. All cars have this problem (that the plastic becomes brittle and fails after a decade or so; and that they all only offer the complete regulator).

I have E46, X5, X3, E90 front and rear clips in stock. Also the 'guide' for the scissor style regulators in 5 and 7 series. And the rear metal 'clip' for the E39 5 series.

Locks for E46, X5 and X3.

Have to check (haven't listed them) what years/models use the door panel fasteners I put on the shelf (and forgot about). Tend to break when removing the door panel, and some bimmer users asked me to stock them. Ah. found it:

Looks like they fit e36 e46 e53 e60: