By specs I mean do you have a link to the unit, it will be easier to help then.
Sorry I read your first post as only having one ring that you wanted to use for both park and brake. If you have two rings it will be easy as, you will probably need a resistor for the park lights. Need more info on the lights to figure it out though.
Yep should be able to do that, provided everything else is sorted first.
Disregard what I said about micro controllers and pwm if you have two rings per light