The M90 is built for the current MXR Phase 90 (M101). To the best of our knowledge this will fit the majority of Phase 90s that have been sold over the past several decades. Please note that vintage MXR pedals, both script and block, are incompatible due to the non-flush input/output jacks. If you are interested in getting a Sole Control for a vintage pedal please contact us and let us know. Sole Control Fader measures 2.37x4.36x1.26 inch (60mmx110mmx32mm) Feel free to Contact Us if you have questions regarding size/fit, and we will do our best to help.