Recommend me a new rear door

I noticed over Christmas that the latch indent on my rear door has corroded through at the bottom and is now just a nice hole.
I will, hopefully at the weekend get the door card off and have a look, with a view to repairing it if the rest of it is still ok. The bottom frames has not rotted through so I am hopeful. I know you can get the frame rails as repalcemtn panels, does nay one know if you can get the latch section as a repair peice or am I making a patch to fit?

Also I have been looking at replacement doors, as this is what I did about 8 years ago before I learnt to weld when the previous door rusted away, I got a second hand replacement at a show jumble.
There is now much more choice available that there was then. looking at replacements the options are:
second hand "split" style
second hand td5/later style
new "split" style
new "split" style with galvanised frame
new "split" style with galvanised frame and galvanised steel skin
new td5/later style
new galvanised td5/later style.

I have a swing away wheel carried so it does not carry the weight of the spare wheel, and I have a rear wiper fitted. If it is not repairable, what would peoples recommendation be for a replacement?

I got a new rear door from S&p panels. Nice basic door for not a lot of money but holes for hinges and lock barrel a little bit out.