I'm looking at getting a replacement box for the Sera, which uses an A242L transmission, and want to rebuild it before it goes in. (I've already got the Toyota workshop manual).

I have found one place in the states that sells a rebuild kit, but where can I source one locally?
Toyota sell a transmission overhaul gasket kit (part no. 04331-12080) but not a complete rebuild kit.
Is it just a matter of stripping down the box and buying the parts individually as I need them? I do get trade pricing at Toyota, so I guess it's not too bad.....