I have a 95 skidoo ss 670 with 1.25 lug track and 144 studs. It has metal skis and
I was wondering what runners to use. I have good luck with woodys but witch model?

I would guess with 144 studs and 1.25 track you would need about as much carbide as possible. I have a 1.5 on my MXZ and the 6 inches I can get for the ultra lites are not really enough.