Star shaped bolt heads for OT seats and thwarts.

Hello, I’m trying to lower my stern seat and to put in a new portage yoke. I would like to keep the same hardware but I can’t seem to find it in the old town site. The bolts have an elongated star shape to them, which I do not see in the website. Any ideas where I can find this stuff? 4 1/2 inches long with the star shaped head.
Thanks.

 

Rollin has them

https://www.wooden-canoes.com/canoes/materials/hardware/

 

Thanks shellgrake