Due to high number of requests let me make some short summary of units that can be installed in Octavia III cars. I have focused only on MIB2 / MIB2.5 units, to indicate differences between them.   Simplified Bolero MY15 unit 5Q0035819 (without DAB) or 5Q0035820 (with DAB) Simplified Bolero MY16 unit 5Q0035819A (without DAB) or 5Q0035820A (with DAB) Simplified Bolero MY17 unit 5Q0035819B (without DAB) or 5Q0035820B (with DAB) Simplified Bolero MY18 unit 5Q0035819C (without DAB) or 5Q0035820C