You can use VW Bug automobile adjusters. Two of mine are those. The only difference from stock is the head is a slot instead of the little square part. I forget the years to ask for but you can match them up at any parts store. A VW guy told me he likes to use old original adjusters when he can get them because the metal in the new replacements is no good, but I haven't had any problems.
BTW, to clarify these WV adjusters are not "elephant's foot" type. Those you cannot get in or out without working on the camshaft. Without removing the engine from the frame, as far as I know. Dubious net gain to be had there....