Front seat change options

[Mavis628]

Hi guys
I’m looking to change the front bench seat to a single seat I no obvious option would be a single caravelle seat would this fit straight in, and would I be left with the rubber flooring missing?
Are there other options of another manufacturer seat fitting straight in?

I also want to put in two extra single seats behind the front seats, crash tested and isofox, any ideas of what seat I could fit in there I have a company in Bristol that will fit them, they need to be removable.

thanks in advance for help