I found a crack in the base of my oil filler tube = for my 82 Diesel Westy.  When it was torqued down the crack would = spread.  This has been the source of my leak.
 
I am looking for the upper tube and the "O" ring.  I have not = found one in the area.  The part number is 068115301A and the "O" ring is = N90090501.  If you have one laying around or have one in stock = please let me know.
 
I could also use timing belt tensioner # 068109243F, and the = waterpump to alternator belt. 9.5 X 600 LA.
 
Thank You..
 
Bill