A cheeky way to bump the thread.
The below is a post from the 1Addicts Commercial Sales forum.
Originally Posted by ezeedee
how does someone find out if they have a 6 or 8 bolt? i didnt know there were two different styles until i saw this thread.
I suspect it is a function of build date.
The earlier 135i's such as yours have "8 bolt" flywheels, where as that later models such as mine utilise "6 bolt" units.
I am not sure if it's the same for 3 Series N54's.
I am fairly certain all the early model 335i's use a "8 bolt" unit, but I do not know if that also changed somewhere in the production cycle.
If in doubt I imagine quoting your VIN/Chassis number, to somebody like Dan@BMW United would allow you to determine what version of flywheel is required.