There are only 2 rotors used in North American models of 2wd Vanagon.
Here are the model year ranges.
80-85, paired with an opposed dual piston caliper setup. (diesel and
gasoline are the same)
86-91, paired with a floating single piston caliper.

They are not interchangeable. The diameter, thickness, and offset are
all different. Since they are not yet mounted, a simple way to check
which rotor you have is by diameter.

80-85, nearly 11".
86-91, just over 10".

Mark

Eric Zeno wrote:
>
> Thank Don,
>      If you has a rotor with after market part numbers, (Like I do)
> is there a way to determine witch is witch?  Obviously the
> Syncro has no bear surfaces.  What is the different between the
> "A" and the "K" suffex?  and for that matter, the Diesel rotor?
>                                                         Eric
>