Q:  E-UAA compatible with the Modline 5  Like  UAA 

A: Yes this  E-UAA can be used on existing Modline 5 
E-UAA is not identical to the Modline 5 UAA. see pictures below 
Once the universal adapter is fixed to it is compatible with all Modline 5 series models and allows the reuse of inherited mounting accessories.

E-UAA 3.35 inches long