Yes, the Marchetti's did have wingtip tanks.
As for the PC-9's, I've never seen any PC-9 with a wingtip fuel tank or pods...
Switzerland
Slovenia
Croatia
Irish PC-9 fitted with gun and rocket pods
The PC-9 can be fitted with 6 hard points, 3 under each wing, which you can see fitted to the Slovenian PC-9 (pictured above), but the Air Corps aircraft only use 4 hard points. I don't know if the Air Corps PC-9's can be fitted with fuel tanks, I was told before but can remember now
, it all depends on whether or not the plumbing exists. Either way, the Air Corps only use 4 hard points but none of these are near the wing tips.
Regards,
Frank.