My upgrade what I have done ,not on the car yet I use 120y hubs there is one model 1977 thats what I was told they came off they fit straight on the 1000 axle which they do I have tryed them they use the same bearings. 120y's have a taper on the hub where the bearing sits but the model I have look identical to the 1000 .The set up I have came from a 1000 coupe race car down here he has had no probs.with brakes he has very quick car.