can anyone help me with 4x 16" inertubes for the indy please.

Have you got tubed tyres? If you haven't don't fit tubes. If your tyres are going down get them reseated and the rims checked.

i'm fed up with having them reset to be honest

Tubes in tubeless tyres will end up giving you even more slow punctures.

The ribs inside the tyres rub on the tubes and then give slow punctures.
I know, I had this with my Land Rover.

13 punctures in 11 months.
5 new rims and tyres, problem solved for 4 years till the tyres wore out

What state are your rims in, and what tyre pressure are you using?