Multitool Adapter™ - Click-In Edition - Oslo Tool Company Int.
Adapter & mounting screw for MSX(E) models to Starlock mount – Quality Tools Online
Amazon.com: Fein MultiMaster Adapter Oscillating Attachment Tool Set for MSX 636, MSX 636-1 and MSXE 636 II - StarLock Mount - 35222927050 : Tools & Home Improvement
Starlock compatibility check | FEIN Power Tools, Inc.