And another thing or two...
Bryan - I own a 1972 "L" model (manufactured in 1971), and the combined taxi/landing light for an L model would be in the lower cowl - not on the left wing leading edge as on this plane.
The instrument panel outline is that of an L model, but the guages seem to be a mix of different years.
The L model OEM guages that I have seen all have the numbers on the outside of the graduation markings for each guage. These guages have numbers on both inside and outside.
Perhaps, Cessna was at the transition point between the K & L models, and the changeover was a running change?

Dale