Chassis Number - :dunno: Usually inside cab, not on chassis on modern trucks, try looking for plate under or beside drivers seat. Might be inside door pillar of cab, front or back. Just keep looking around in cab, you should find it ;-)
Motor Number - plate found on left side of engine, at front, 1/2 way up on side of timing case. Will probably give a Leyland Daf i.d., but it is a Cummins 6B turbo 150hp, all you need for parts!
Hope this helps.