If it had the PowerTorque engine, some at least of those 550's had a larger fuel tank mounted on a 'shelf' attached to the cowling, rather than the 5L handle-mounted tank.
Cheers,
Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
| 
