So you're repopping the retainer? Once I bought a NOS one from George I realized it should be pretty easy to reproduce...or is my assessment wrong?
The handbrake drums and t-case output shafts are available via Australian sources (Terrain Tamer I think) because they were used there well into the 1980s. Are you selling those as well?
Yes.
We stock plenty of the drum & shaft too. For example:

Split Transfer Case Park Brake Drum - Fits Split Transfer Case 19 Spline Applications (PB60030)
Toyota Land Cruiser Split Transfer Case Park Brake Drum
