we have detailed dimension of most excavator models,so usually do not need you supply the detailed dimension of your excavator.
You should supply us follow detail:
-Purpose of the long boom.(Such as dredging river,port construction,etc)
-The main parameter you required.(Such as the Max reach height,Max dig depth,etc)
-your excavator model.Such as Komatsu PC200-8LC,CAT330D,Hitachi ZX200-5,etc
We will give you our advice after get above informations.