How many holes (for the side fins) are in each side of your GO 170?
3 per side or 4 per side.
Do you know what year model your GO 170 is?
Should be in the first few numbers of the serial number :
I have a couple of sets that fit some of the GO's so if you can tell me how
many holes and the year model, I could probably ship them to you.
The tether could help your kids through the "can't stay upwind" part
of the learning curve, but I've never tried that. Much better if they learn
steer/stay upwnd independent of any tether line.