Flexmounts are specially designed to work with Hollow Shaft versions of the SIL 3 safety encoders. Do not attempt to replace with any other mount that is not certified for this use. When ordered as part of the model number (DX** for the DSO5 and DW** for the DSU9) they will come installed on the encoders.
Flexmounts can also be ordered separately as kits that include the mounting hardware. Use the part numbers as indicated in the above drawings: M9445/044 for the DSO5 and M9445/045 for the DSU9