What resistor do I need to run a 6 volt choke element on a 12 volt car ?

get a 12v choke

Would like to fit a 12v choke but the only ones I've seen are the wrong size and I don't want to swap carbys.(28pict)

yeah there's a 28 pic that takes the bigger style choke you wont notice the difference looks wise

as the original air cleaner covers it all

Thanks Dave. Will try Boris.