New here! 65 Stepside, help with parts

[[JP]]

Hi there.
I'm new here, from the UK, bought a 65 stepside and waiting for it to get in a container and on the way to me.... I've made a post on the welcome area, but I'll leave some photos here as well.

As I'm in the UK I need to be sure on what parts to order, have a friend visiting the US in December and he can bring them over for me.

What I need is the push button lock cylinders for both doors, I've read about here and seen people got into trouble with them not working with the old handles / had to be modified. but I was just want to be sure I'll order all the parts I need as I'll only have one shot at this.

would I be right, I've looked in LMC trucks website, that I only need part #9 on this page? http://www.lmctruck.com/icatalog/cbe/full.aspx?Page=15

Also, I have a little girl and need to fit seatbelts, any recommendations? I've put a photo of the interior further down.

thanks all for advice.