engine cranking but can not start

Hi all,

I am Didier from DR Congo(central Africa) owning an Isuzu wizard 4WD,  4JX1 engine model UES 73 manufactured in 1999.

I have been using this car since 2010 and the mileage is currently at 115,000km.The engine is failing to start and oil and coolant are getting mixed in the radiator and oil sump level has increased.

Can someone provide me with contact were I can purchase, the following spares:

injectors overhaul kits (o-ring,copper washes,and seals),manifold gasket, head gasket ,and Oil rail pressure sensor.

Thanks