Looking for rotary switch knobs to suit a 411 dash

[Kevin H]

Having installed an air con system on my 411, the original rotary heater controls are now redundant, so I have set about intergrating the air con controls in the dash, instead of using the tacky add-on panel that came with the VintageAir AC system.

I have rotary temperature and mode controls but the original switch knobs from the Bristol do not fit the D shaped shafts on the new switches.

Does anyone know where I can get rotary switch knobs to suit a 411 dash?

the attached pictures show the old control and knob alongside the new switch, plus another view of the knob I want to replace. So I'm looking for something similar that fits the new switch.