I have a Gen 1 shift knob for sale, came off my 2004 R53. Shows wear around the outside of the shiny part, tried to show in pics but I'm not a photographer. Also, explains the huuuge pics $20 plus shipping (should be minimal)
Here is the same one on ECS for some more info. https://www.ecstuning.com/b-genuine-mini-parts/mini-gear-shift-knob-6-speed-leather-chrome/25117542272/