Switch to yellow flasher lamps

Hello together, the friendly TÜV man was with me and made an inspection for the full acceptance. He has faulted among other things the front turn signals. I have to change the white light bulbs in yellow. There are two shop lamps available 12v 21/5W with two height-delayed pins. I do not know why a two-fade lamp is built in. There is also always only one thread, both with the turn signal and with the warning turn signal. For the permanent light is an extra lamp available. The TÜV man n also talked about dyeing the lamps orange with felt pins or something. Does anyone have experience with it or knows where I can get the lamps with the height-shifted pins in yellow? Haven’t found them in the net yet.