Giant tcr 2013 seatpost :)

[jamson2279]

Hello, this is the frame: giant tcr advanced 2013
I don't have the original seatpost, I haven't found it on sale (for an adequate price).
Inserting the tube and spacer will not work (there will be gaps as shown in the picture, because the hole is not round at the beginning but arc-shaped).
are there any options?

 

[Walterscot]

Would this be worth a try? It’s from a Giant Propel from the same era.

Edit: I’ve just cleaned it up; it’s very clean with no scratches or even insertion marks.