Try KOK ball joint boots from Repco for example.
Their range is as follows: -
Sizes available and part numbers are
part number: TE1. Small inner diameter: 12mm Large inner diameter: 26mm (small is obviously the top of the boot, large is the bottom)
part number: TE2. SID: 12mm LID: 29mm
part number: TE3. SID: 16mm LID: 34mm
part number: TE4. SID: 14mm LID: 34mm
part number: BJ5. SID: 14mm LID: 40mm
part number: BJ6. SID: 19mm LID: 40mm
part number: TE7. SID: 50mm LID: 64mm
part number: TE8 - no sizes given
part number: TE9 - no sizes given
part number: TE10 - no sizes given
https://www.google.com.au/search?q=kok+ ... BFcQsAQIOw