Hey,
Sorry for the late reply. Not sure if this will still be helpful to you but I'm posting anyway for anyone who comes across this post.
I bought these from AliExpress:
https://www.aliexpress.com/item/32972982062.html?spm=a2g0s.12269583.0.0.5cd378a2qDCOst
Unfortunately it took a while for me to get it due to the pandemic (6 months), that's why I'm only replying now.
Anyway, the good thing is that it worked! Just make sure to connect it to the 3-pin argb header on your motherboard and set Sapphire Trixx to 'External' control for the lighting.