my panda head did come with white nylon ones,with an outside circlip,i searched every where for them,in the end a guy from the fiat uk site offered some early panda ones,(not 850,sorry),he used the rest of the gasket set for 850 rebuileds and had these over....they are the closest i could find.and seem to be ok.....panda 30 parts seem very hard to find,as does info on the cam/dizzy used etc......got to be more to that 30bhp than carb and head?