bachmann porter idler gears!

[steamskip]

so once again this problem has arisen on a bachmann model basically i purchased the model as part of a job lot sold as running and it did once i did minor repairs to the slide bars it ran well but alas the gear stripped and now has a rut and a flat on it.

so basically my question is there any replacement gears available out there? any help appreciated !

regards steam skip!