While you can find NFS Most Wanted J2ME floating on the internet, there seem to be an another version of it. The one you can possibly get is a version with only 6 cars. There is another version that has 8 cars instead.
One of extra cars is the Dodge Viper.
The hud is also different than the version you can easily get. There is a turbo gauge,gear shift indicator and proximity bar which doesn't appear in the 6 cars version.
I also found this picture of a version with a different hud. It only lacked a proximity bar.