Hi,
engine number: 6 7 Y 09788
Engine type = 6 --> 6 pistons
Engine version = 7
Model year = Y
Engine number = 09788
To check the exact DOM you'll have to check the FIN of your car. First 2 numbers say the model year.
Example:
W P 0 Z Z Z 99 is model year 1999
W P 0 Z Z Z 00 is model year 2000
Double row or single row?
Think you quoted this:
Pelican Technical Article: Boxster Intermediate Shaft Bearing Replacement and Upgrade (IMS) - 986 Boxster (1997-04) - 987 Boxster (2005-06)
09788 might be a double row engine. But i would check that on the car as Gelbster said. The numbers are not 100% valid.
Hope that helps.
Regards
Markus