My '99 gear knob has lost its cap and is ugly anyway, and a mate's facelifted A3 has a S3 shifter so I was looking at transplanting his original into mine. At first blush, it appears the actual attachment system and reverse-pushdown system is different, but it was dark and I was pretty tired. Is this going to end up being some hellaciously involved process or is there a simple way to install it? I know the gaiter frame is different and that's fine, happy to do whatever is required for that.