FCM1608 ferrite beads are a series not carried by DigiKey. We do have a list of alternates available for this series. 1608 calls out the EIA size in millimeters which is the size of the chips I listed, one of these should meet the needs for your application. When selecting an option from the list be sure to choose the proper impedance and current rating based off the chip you are looking to replace.
Please review the datasheets to ensure the alternative will work for your application.
Update 6/12/25 We now carry the FCM1608 Series
Ferrite Beads and Chips | Electronic Components Distributor DigiKey