Hi Thierry,
I don't have a part number, but just order generic "Right angle single row header pins". The single row ones I've bought have always had the plastic part on the short (PCB) side.
However, I have searched and searched for ones with the opposite profile, ie the plastic part on the long leg, but not found any. With double row ones, though, the plastic only seems to be on the long leg, not the short (PCB) leg. So, this makes it impossible to mix & match single and double headers on the new 'enhanced bus' modules :-( But if you know where I can get either of those the opposite way around, I'd be very interested.
Spencer