Unable to find Manuals and parts list

Hello all, 
I've been searching for over a week for the Manual and parts lists for my Briggs & Stratton engine. 
 
Its a 11.5 HP I/C OVH engine.  Model number shows as  FAMILY: 5BSXS.3442VM  276012
 
I've searched on the Website and it says 'Not found' 
 
I'm wanting to replace the air filter, oil filter and the sparkplugs. 
 
Can anyone help?
 
Images attached. 

Thank you