The LatteCrema System with manufacturer product id 5513294571 is not listed as compatible with the De'Longhi Dinamica ECAM 350.55B model. It is compatible with various ECAM models such as ECAM 28.464, ECAM 28.465, ECAM 28.466, ECAM 28.467, ECAM 44.660, ECAM 44.664, ECAM 44.666, ECAM 44.668, ECAM 45.366, ECAM 45.760, ECAM 45.764, ECAM 45.766, ECAM 46.860, ECAM 516.45, ECAM 550.55, ECAM 550.65, and ECAM 556.55, but the ECAM 350.55B is not included in this list.

The De'Longhi Dinamica models that are confirmed to have the LatteCrema System include ECAM35075SI and similar variants, but not the ECAM 350.55B specifically. Therefore, this LatteCrema System accessory does not fit the ECAM 350.55B model.