Red filter that fits the Olight Odin?

I own an Olight Odin flashlight and was surprised to learn that there is no red filter made specifically for that model (29 mm bezel diameter). I'm hunting rats at night and really need to find one. Does anyone have a workaround? If I could find a filter that's just slight larger, say, 32 mm, I suppose I could fill the gap with some tape to get the filter to stay on the flashlight.