You can also try a Delorto VHSA32 which is a 32mm carb used on the TZR 4DL which shares the same engine as the DT125R.
Only putting it out there, if it were me, I'd go for a tm28ss which is standard on DT125R from 1991 as Darty says.
The jetting changed in around 1996 as well but that will depend on the conditions of where you ride so you'll have to experiment with that.