In some cases it is inconvenient to mount a filter holder on the front of a view camera lens. Hitech makes adapters for their System 100 filter holders for mounting on the outside of the rear lens element. These adapters are offered in incremental sizes. Your lens should measure the same or slightly smaller than the rear element adapter ring size designation. These adapters tighten via 3 equally spaced plastic set screws.
NOTE: Make sure that you have enough space inside the bellows to do this.