There are only 1-1/4 inch hitches available for your 1999 Isuzu Oasis. 2 inch hitches are reserved for higher capacity vehicles like trucks and SUVs.
There are bike racks and cargo carriers that fit the smaller hitch size though.
The most popular bike rack we carry that has been confirmed to fit this vehicle is the Thule Camber 2 part # TH9058. We asked our demo and install guys to name their favorite, most easy-to-use bike racks and this one showed up in nearly everyone's top three.... view full answer...