Thank you for your question! The shower should have a series number listed on the plate, directly under the handle.
If you have a 1300 or 1400 series shower, you can use a either a T13 or T14 series trim kit. However, you will need to use the existing cartridge rather than the one that comes with the trim kit (RP19804).
If you have a 1700 series unit, you can use a T17 series trim kit, using the existing cartridge (RP32104).
If you have a 600 series, you can use the RP54870 renovation kit.
Date published: 2015-12-31