Taulman 910 Nylon
You will need to loosen the timer mechanism to fit this on. I would heat it up with some hot water to make it easier to slide on as it will be a snug fit. I put screws (M3 holes) in, but honestly, I may not have needed them it's that snug. To make sure the knob matches the position of the timer simple turn the knob while connected to the timer mechanism (don't tighten screws!) until the mechanism has reset and the knob is pointing to reset (now tighten the screws).
If you don't have the means to print one of these and need one, send me a message. I've got ya covered!