what size jets for 125 shot?(zex wet kit)

There will always be variables to this. Fuel pressure, bottle pressure, etc. But here is a handy little jet calculator I found.
DynoTuneNitrous.com

I am using a HarrisSpeedworks wet kit and it gave me a pretty accurate calculation. The recommended jets from HSW were damn close to what the calculator showed. Also, not sure if you know or not, but the Zex and NOS kits were rated at the crank and not the tire. HSW, NX, and DynoTune nitrous kits are all rated at the tire.

All kits will be a little different, but the recommended jets for my kit are

75hp........n2o--0.044 fuel--0.026
100hp......n2o--0.052 fuel--0.028
125hp......n2o--0.057 fuel--0.032
150hp......n2o--0.062 fuel--0.035

So depending on fuel press and bottle press, the jets you mentioned should be close. Probably somewhere in between 100-125hp. The n2o jets may seem too small for the shot I'm running, but my kit is rated for 900psi bottle pressure. Most kits are rated for 1000psi.