which carpet kit should I buy

[niftyrodman]

They all look about the same, but looking online is a bit guessy, As I am in Australia freight is expensive, so I need to make the right choice. Green I am after.

[Chief]

If you want it to look as close to the original as you can still get, then your only option is:
https://newtoncomm.co.uk/collections/4- ... 2016417843
(the pile is about 1/3 as deep as the original hessian backed carvel carpet, but it does look, from the top down, like the original).

I don't know whether your '54 model would have also had underlay, but the correct stuff in terms of my '63 car (so almost a decade later I admit) is this:
https://www.martrim.co.uk/car-trimming- ... ductId=721
(sadly I see they now sell it per meter, used to be the only supplier that did half meters, so it worked out cheaper - it's possible you may find someone selling this type of underlay closer to home).

[firedrake1942]

Originals had no trim around the outside and the modern ones lack the toe pad protector on the gearbox tunnel. I have a couple of these (original) if anyone wants one.

[Chief]

In the '60s the footwell mat was also the BMC chocolate box, again I don't know if this or the toe pad firedrake1942 mentions would be period correct for a Series2 if that is a concern for you:
https://www.car-hood.co.uk/rubber-heal-mat