I need an LT230 which has a 1.2 high ratio and a 26 tooth input gear (so that I can fit an underdrive).
A Disco I box up to serial number 28D308626E should be just fine.
To find the serial number see here.
If you're not sure send me the serial number and I'll ask Dave Ashcroft.
I'd prefer one that's in good shape because I'm lazy but I'm prepared to recondition it if I have to.