I need a help in translation, is this right ??

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This month I'm going to Bulgaria for holidays. I'm driving there by a car , which I lend from my mom. The bulgarian law says that I need to have an authorization to use these car there. So I've written something like this - can sb help me and check the correctness of this. I will be really grateful. So:
"To Whom It May Concern

.................................... (id number: .............................) authorizes Mrs. ..................................(id number: .................................., passport number: ...........................) to use the car ......................... with registration plates .................................. and VIN (body) number ......................................... while traveling in a private matters outside Poland.

This letter is valid far in definitive period of time."