Bigger oil filter for KZ1000 shaft.

Fram CH6014 looks about 50% bigger than CH6012 for non-shaft models.
According to bikebandit in 1980 police bike was KZ1000E. shaft
Maybe shaft model was designed for police use.

motorcycleinfo.calsci.com/FilterXRef.html

The same filter was used on all the KZ1000s from 1977-1980 including the shaft model. 1981 they went to the KZ1000J which used the smaller filter like a KZ650 used. The police were never shaft models, they ran the older chain model based on the KZ1000A series through 1981, then in 1982 up ran the chain drive model based on the KZ1000J for the remainder of the police model run.