What is this fuel fitting sleeve?

[Archer181]

The fuel line on an Archer is 3/8 aluminium tube. This is a photo of a section of the actual Piper
line below. I am guessing the nut is an AN818-6D but I am looking for the part number for the sleeve on the fitting below. A supplier told me it was an AN819-6D sleeve (MS20819) but the photo of their part number does not look right as it seems to have a female detail. The Piper sleeve seems to end up with a point more like a plumbing compression olive. See the supplier part number directly below the actual Piper photo. Can anybody identify what this sleeve is?

Piper part above

Supplier suggested part below

 

[magman]

 

[Tom]

 

[Archer181]

 

[prfixer]

 

[kshaw]

 

[William OBrien]

 

[William OBrien]