4.10/3.50-4.0 tires will fit onto the same rims that 10x3.00-4 tires fit onto so you could use an eZip 450 rear wheel assembly item # WHL-E450R and install the 4.10/3.50-4.0 tire onto it. Item # WHL-E450R is available on this page: http://electricscooterparts.com/ezipe450scooterparts.html
Please let us know if you have any questions.
John Ellis