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Since BMW never sold an E9X without A/C, you will never find an official belt that is the correct length to bypass the A/C pulley.
But there is nothing magic about BMW belts. Go to any autopart store and buy a shorter belt. As long as the width and number of grooves matches, then you will be fine.
I've done this on other cars.
Things to ensure:
1) That the belt is not too loose. If it is, it could fly off at high RPM and do some real damage.
2) There is no official belt routing diagram, so make sure the pulleys are still rotating the correct direction.
3) Make sure the belt won't "move" and make contact with anything in the engine bay when the engine REVS.
4) If you're not comfortable doing this, then don't. Get the A/C fixed.
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