That's a smog number.

Model & Type are usually labeled as such.

http://www.outdoordistributors.com/Briggs_And_Stratton/briggsmodelid.html

Already tried that............ Have worked on hundreds of Briggs and have never had a problem finding the numbers.... This 550ex is a new breed

Model located near the OHV cover. Its on the housing to the right. Get a flash light and shine this looking in front on the engine view. On my customer mower, there is a scan code for serial #, below that on the metal housing you will see the model type code.
09P702-0005-F1.... since the 9p702 shows, we must add a 0 in front to get the 6 digits for the model.
Heres some more info on this new engine by Briggs.
http://www.briggsandstratton.com/us/en/engines/push-mower-engines/550ex-series