i noticed some GPS systems with the measurments needed to fit, but some were labeled for b5 models and my passat is b5.5. i owned both they seem similar as far as measurments, but im guessing its wiring? ex: would my stiring wheel controls work with a GPS system? if u know where i could find GPS systems for passat please let me know. or does vw have any OEM GPS systems for passats?