You can always try ebay. I'm finding three on there or so by searching the part number ( 73224-SK8-000):
https://www.ebay.com/itm/155182315453
Also, I highly recommend against ordering any parts from hondapartsnow.com. I've tried before and they have terrible service, promise parts that they can't deliver (will say in stock when it DEFINITELY isn't), and aren't really a Honda dealership or anything, they're just a shady parts aggregator that sells every part on the planet. Check out their reviews online and you'll see what I'm talking about.
I'm in the US and if I need US dealer parts I order from Bernardi. They've been super fantastic. I also use Impex and Amayama for pretty much anything I can though, as the prices in Japan are much more favorable. I would also double check that the part number posted IS indeed the rear hatch glass OUTER molding. In the diagrams, it looks like it's under the glass?? It also doesn't look like it runs below the window, it just seems to stop at the side, and in the pictures it really doesn't look like a "T" molding. Though, I've seen incorrect diagrams before. I can't find any other part it could be, but worth using some caution perhaps. Though, the ebay set is like $35 us, so you're not out too much if you just take a gamble.
Cheers!