Greenlight Collectibles 1/64 Scale, Troy's Toys and Collectibles Exclusive Johnson County Sheriff 4 Piece Set. The special set includes a regular edition Johnson County K-9 Unit with matching Green Machine Version and Johnson County Sheriff Unit 331 Patrol Car with matching Green Machine Version. There were only 48 Green Machines produced of each car. The sets are very limited! THEY ARE LIMITED TO ONLY ONE SPECIAL SET PER CUSTOMER.