The chain guides you mention are made by Meyle, not Mahle. As far as I know, they only seem to be available for the M116 engine. (See, e.g., EuroPartsDirect.com.) I have had them in my 380 for some time. When I did my chain last year, 70,000 miles after their installation, they still looked like new. It sure would be nice to have that peace of mind for the M117, too.