finchoice on carve 131

[DJluc]

Hello,

Could you help me on this:

For the next couple of months ( untill he gets his own ) my son wants to sail on my carve 131. He's about 45 kg and sails 4.7 till 6.0 sail, flatwater force 3-5. What should be a good a good finchoice for
good tacking and upwind capacity?

Thanks for advice.

Luc