Never had a problem with fitting or fittings...... sounds like the garage haven't got a clue
4 pipes coming out of tank....
2 top 1's go to flame trap under inlet manifold and the pipe that has to be put into rocker cover
large bottom pipe vents to atmosphere
smaller bottom pipe goes to oil return under turbo
Have you got pics of the fitting kit that way I can tell you if its the coirrect kit???