86 20-3 FB5 CMC 1208

We can supply a replacement for this balance, but due to that "86" stamp it will have to be a custom order. That number tells me that your balance uses a special spring configuration that is incompatible with other models. 

Before we go any further, can you first tell me how many you wanted to buy? Can you also tell me the depth of the bottom fitting? If you were to stand the balance straight up and think of it as a foot, the depth would be the "heel to toe" measurement. Thanks!