old toy cap for connection

I had this toy when I was a boy, now my mom lets my nephew play with it, but it is missing a coulple of these end caps .. so I was tasked with this , after having shown some promise of making broken things to my brother !
This is a ruff draft so have a draft as you wait for the final version !
The pic of the hand holding the part is of the original, not a printed version.
* Printed the 1st one and it was way too small, design started without really measuring ,also the printer was flaking out while printing ..
v2 printed well adn is dang close, the bottom brim is not quite up to diameter and there arent the vertical interference fit beams but very close..