I had the original LPL 4x5 enlarger called LPL 7450, then the next upgraded slightly heavier duty version, LPL 7451 and further models as they changed them. The USA models are called 4500 and 4500 I and 4500 II as far as I understand it.
The wall mounting system is really good and with some slight modifications (drilling a hole or two) their wall mounting system will also wall mount the 6x7 models. I've used a single 4x5" LPL wall mount, to mount a 6x7 LPL as well as the first and second LPL 4x5 models.
The later 4x5" versions started out with a 50mm enlarger head extension; meaning the lens was 50mm closer to the operator and 50mm further away from the column. I seem to remember that the last version was even further away from the column.
Once you grow out of the excellent LPL enlargers, treat yourself to the best, a DeVere 504 free standing, precision exemplified.