Default [Q] S3 metroPCS 530M simple question

Hi to all, I 'am a little confused with all the S3 version that are around. I have an S3 MetroPCS SCH-R530M...I wanted to install a custom ROM and I only found roms for "d2mtr" (like the CM10), how can I be sure that my phone is d2mtr ?

Thanks.