The 4 speed conversion must be a real bonus!
The handbrake pads are a girling system I believe. Also used on the Aston V8s, Rolls Royce Silver Shadows and Jensen Interceptors. They look really odd because of the way they seem to be worn away on one end and not on the other end.
Powerflex poly bushes do have most suspension bushes and the rollbar bushes, though not fot the drop links.