This is a basic how to guid for accessing the power antenna housing to remove the broken nylon cord and replace it with a new mast. Can be a little intimidating so hopwfully this makes it easy for people.
Link for fender clips
https://www.amazon.com/gp/product/B01AGDUTCO/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
link for antenna- this fots lx470 and land cruiser and maybe others.
https://www.amazon.com/gp/product/B00JI9SW7C/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
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Interesting video. I've had to replace the one on my RX300 twice, seems like it's not a strong design. Don't think I could replace it like you did but I liked seeing how it could be done. Good job.