[Jukebox-list] AMI JKK 200

Why does the model J 200 have 2 K's after the J? Model JKK 200. Is there a model that just says J?

While I'm at it, does anyone know the size of the o-ring for the scan control? I know who has them for sale but I hate to pay 7.50 for a 1 dollar part. Although if I count my time, the $7.50 might be the bargain?

Tony