MAN/Centro's

[PM]

As people may have worked out, I am a big fan of these buses that diamond have. Was looking up on buslistsontheweb and found out that there are only between 40 and 50 of these buses. Wasn't aware of how rare they were-801 and 806 are longer and the only ones that seat 45 although similar length ones were bought by airparks. Are they on a lengthened version of the same chassis as I don't understand MAN chassis coding-whats the difference between 12.240/14.220/14.240. Just interested