I just finished putting in new wiper blade inserts into the original wiper blade frames. Took more time in documenting the process than actually doing it. Very easy to do, cost is about $7.00 for a set.
This is a write-up on how to refill the Tesla model Y wiper blades. The wiper blade refill is for a 6mm cross section for frameless wipers. The box comes with 4 refills and you cut to length. As you can see, the cross sections are exactly the same.
https://www.amazon.com/gp/product/B07MGNQWB4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
The trick is to remove the end caps on the wiper blades, I used a very small screw driver to gently pry the ends from the metal rails and pushing against the cap, it will pop-out. The video link below shows one way, if you can pull the rubber out the cap comes off very easy, no prying needed.
To start, remove the end at the “top” or the end furthest away from the bottom of the windscreen. The reason is that there is a feature that holds the insert from moving. See image below, there is a small slot
In the rubber that mates with two small protrusions in the end cap. You will need to cut this slot in the refill. Slide the rubber out, lay it next to a new refill and cut to length.
Mark the location of the slot with a pen, then cut the top of the slot with a razor blade, I removed the top rubber with a pair of wire cutters. Slide the new insert into the wiper blade, at the end, place the end cap so the protrusions are over the slot in the refill and push the cap back on. Done.