How much was this kit?

This transmission is definitely used in other Mitsubishi vehicles, so if you find out which these are you can go to amayama and buy these seals and other things you need.

I have used amayama many times before and the prices are generally quite good. In fact, OEM parts from Amayama are cheaper than aftermarket parts in Australia. They also have an Australia warehouse so I'd say that many OEM items for these cars would be available in that warehouse (which is in NSW somewhere).