engine parts for m62tub44

looks like i will have to recondition my 4.4 m62tub44 engine due to it smoking a bit (sometimes a lot).

the idea is to replace everything that needs replacing, including oil pump, etc.

needs help to get the parts required to recondition the engine as LR only sells complete engines and BMW does not understand why we wanting to buy parts from them.

any advise as to where i can buy the parts is appreciated

btw the engine is in a range rover