In order to identify the part numbers you require please visit the Honda website at http://www.honda-engines-eu.com/en/welcome.html where you will be able to select your engine model and type and identify the products and part numbers you require.
Workshop Manuals
Honda workshop manuals are available direct from Honda. Further information is available from http://www.honda-engines-eu.com/en/engines/models_range/gx_range/shop.jsp

Chrome Side Shroud and Pull Start.
Chrome Exhaust Shroud