I ready many thread, but none seem to mention the exact sizes needed. From what I have read there are three. One person used these sizes as the closest match possible:

3/32" cs - 2 1/8" ID
1/16" cs - 2 1/2" ID
3/32" cs - 2 1/2" ID

But those are in inches. I was wondering if anyone had the measurements in metric. If not the above will probably work. But I would like to get metric if I can find a shop that happens to have them.

Also does anyone recommend a type/brand to buy or should I consult the supplier? I would assume something oil and heat resistant.

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car