3Racing 3RAC-BE4815 Ball end 4.8mm with 15mm collar (10)
Also fit Schumacher balls without being tight.
3Racing 3RAC-BS4810 Ball studs 4.8mm with 10mm long 3mm stud (10)
@ £7.00
Kawada AJ-4801N Ball stud 4.8mm Alloy. Short thread (4)
@ £4.50