As long as your Mrs is happy with that Polaris

To expand on my previous answer:
What is the exact cab are you wishing to use t-moulding on? Is it just for the outer edges, underneath the cab too?
Maybe you want it round the edge of your CP as well?
Let us know what you are dealing with and we can give you an approximate length.
I posted the image because you could just use a tape measure to find the length if you have the cab already, if you don't have a cab already and your are scratch building then you should be making detailed plans which would you could use to determinate the length required.