Deja: As Milgauss noted, my 7032 still has the chronograph runner it came with i.e. part #8000 rather than #8000/3. To this day, I do not know what the difference is between the two (height?), but #8000/3 is the correct part for the 45-minute counters.
The chrono on my watch runs, but the operation is not perfect. Whether that's due to the runner or to something else (I did drop it onto the sidewalk last October), I'm not sure.
If anyone out there is selling #8000/3 and knows where to get one, please let me know. I think J. Borel carries it, based on a sales post I read a few months ago.