Need diff cogs or new gearbox?

[Coop306]

stripped a few of the cogs in my diff yesterday but can't find the parts anywhere,any 1 know anywhere i could find the parts?? thanks in advance

 

[Greywolf74]

what kit is this?

 

[Coop306]

Am not sure to b honest I bought the car for 20 quid off a buy an sell site,motors runnin perfect just need the diff sorted. There's no markings anywhere on it to say what make it is