Need to change serpentine belts on both my 2009 Clubman S and my wife's 2007 Justa. The dimensions are slightly different - see below. Will this make any difference? Does anyone know the OEM brand?

Dayco P/N 5060358 Eff Length: 35.75
Goodyear P/N 4060355 Eff Length: 35.5
Gates k060355 Eff Length: not shown
AC Delco 6k355 Eff Length: not shown
(all from Rock Auto)

 

When you search realoem.com, the belt for my '07 MCS is a 6K X 905. I believe the 905 refers to length in millimeters. There are 25.4 mm to an inch so that converts to a belt that is 35 5/8 inches long. Perhaps the manufacturers you are using use the same 6 designation for the 6 ribs while their length is inches with decimals. Following that logic perhaps it would be something like a 6k35625 where 0.625 is 5/8 in decimals. Otherwise a 355 would be 35.5 inches long which is 1/8 short and the 35 3/4 would be 1/8 to long. I'll bet your tensioner for the belt will accept either belt just fine. My replacement belt that I have on hand for when I need to replace it is a Dayco that is marked "V7566789 80 02 6PK905 Made in Italy". I hope this helps, IMHO I'd use the Dayco that is 35.75.

 

Makes sense- thanks kukaepe!