I just happened to stumble upon this nice video of all pre 1984 Japanese police cars:

I think the people loving the Seibu Keisatsu regulars at Japanese Nostalgic Car blog will recognize a lot of the cars in this video.

I did spot a lot of Crows, Glorias and Cedrics. But also rare cars like the Ford Mustang Mach 1 and a 240Z and a 300ZX highway chasers!