The suitable replacement saw chain for a Ryobi cordless chainsaw with a bar length of 35 cm is not directly specified in the information provided. However, the RAC255 saw chain is available for models similar to the RY36CSX40B, which is suitable for a bar length of 40 cm. For a 35 cm bar length, the RAC262 saw chain may be suitable as it is used for similar models. It is advisable to check the specific model number to ensure the correct replacement saw chain.