For a permanent repair, Patchboy recommends the use of an inside repair (patch) in conjunction with a repair that fills the hole, following the procedures recommended by the Rubber Manufacturer's Association.
Universal "String-Type" Tire Plug Inserts

4" (102mm) Fat, Brown String Tire Plug, 50 Strings Code: 12-361 Price: $25.75 Quantity in Basket: none

4" (102mm) Fat, Black String Tire Plug, 50 Strings Code: 12-391 Price: $25.75 Quantity in Basket: none

8" (102mm) Fat, Brown String Tire Plug, 25 Strings Code: 12-392 Price: $25.75 Quantity in Basket: none