i'm replacing a few lifters in my mk5 fiesta 1.25 zetec. there's only one type of lifter to replace....but there are loads of different shims i could order depending on size...
i checked all the clearances before i took everything apart and they were within the fords cold tolerances. i didn't check them warm, but i used an automotive stethoscope to find which area the tapping was coming from. it was terrible - i had to stop driving it as it was too bad.

do i need to replace the shims too? if i need to order shims too, how do i work out what sizes to order?

thanks