e46-ee

Hi from Greece, My father has an E46 5/2001 (according to VIN) with Reverse Radio Unit. I want to upgrade this unit with a CD53 MP3/AUX capable and I have to questions: 1) Do we know if MP3 capable CD53 Radios are also AUX capable? 2) Because the car is far away, is there a way to check if it is equiped with one or two aerial inputs? According to realoem.com the cars from 3/2001 have NG Radio (one input). However, is any way to confirm it? Thank you!