Thanks again Gardar - that was what I was looking for. Some vendors show the tensioner pulley as 70mm and some are showing it as 65mm - I can now eliminate the 65mm versions.

*edit* - Rats - more confusion. Further investigation show the 65mm version is the most likely candidate (and not the 70mm). I'll just have to remove the under-shield again and check.

This - FI15010,KM International FI15010; Tensioner Pulley, v-ribbed belt

and this - BMW 330 3.0 Auxilliary Belt Tensioner 03 to 04 T39038 Drive V-Ribbed Gates New | eBay

all indicate to a 65mm wheel.

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)