We do not supply handle foam/rubber as a spare part as this is notoriously hard to put on and in many cases is damaged as it is being installed. For many models we have replacement handles available to purchase.
Many customers have also chosen to use alternative solutions to refresh their handlebar. A common idea are things like tennis racket or hockey stick grips, which come in a roll and are easily applied at home with no tools required.
The foam on handlebars is not covered under our manufacturer's warranty.