Thanks ZX-Ken
I'm will order the original LCD part number just to be safe.

It still may be that the higher numbers are an improved spec, but we may never know as the specs are not in the public domain.

As usual it is all a closely guarded secret controlled by those intent on separating owners from their dollars.

It would be interesting to know why so many screens need to be replaced!

Mine just decided to start an autonomous crack (no impact) after a 6 hour road-trip. It seemed to get pretty hot behind the screen (heater running also) and my guess is that the mounting assembly does not allow for sufficient expansion and contraction of the LCD.
These thing never seem to happen under warranty though, do they

thanks again