You do not need any specific diode, just enter 1A schottky diode, chosse a reasonable voltage and take the cheapest (3A etc. is also fine).To make the build more compact you can also use any other ground source eg from the high beam indicator:
[image: mnz2nnfi.jpg]
My setup:
[image: ok8q3npa.jpg]
[image: jui4p48j.jpg]