Hi Graig , i have a freewave 125 which was supl,ied with the single 32 cm fw fin , i want to fit the tri fin set up , i see in the info on the website the thrusters should be 13cm and the centre 30cm ? but i cant find a 30cm centre fin in the mfc thruster set range, which centre do you reccomend , just a 30 in the single fw fin line ? thanks