Can I use the 'Vector to Vector 2 upgrade kit' to convert my Vector 2 from 15-18mm (back to the standard 12-15mm) - Also interested to know if I can use the parts of a second 'Vector to Vector 2 upgrade kit' as spares for two additional set

Can I use the 'Vector to Vector 2 upgrade kit' to convert my Vector 2 from 15-18mm (back to the standard 12-15mm) - Also interested to know if I can use the parts of a second 'Vector to Vector 2 upgrade kit' as spares for two additional sets of Vector 2s