  We consider (generalized) Kolakoski sequences on an alphabet with two even
numbers. They can be related to a primitive substitution rule of constant
length ell. Using this connection, we prove that they have pure point dynamical
and pure point diffractive spectrum, where we make use of the strong interplay
between these two concepts. Since these sequences can then be described as
model sets with ell-adic internal space, we add an approach to ``visualize''
such internal spaces.
