Dash Layouts in Split Bus

Can anyone tell me if the dash layout changed between 49 - 67 I imagine it did.. Was the speedo and instruments in early models housed in a small rounded array whereas the later models had the same set up but in a more square consol..
Sorry to be vague but I am trying to date a splitty by description on the phone.. I am trying to determine it's age..
Is there a web location I can find the info?
thanks

the splitty eg taillights,semaphores,bumpers as unless its a barndoor the dash is nearly the same exept fuel gauge best shot is chassis number and someone here will know.

this may help,somebody one here this up a few weeks back.http://www.type2.com/library/identifi/vin.htm
all the best
Rob