I don't think the disco axle would be up to it if the 110 was loaded to it's capacity. 300tdi 110s had a disc braked Salibury which could be one option. The other is the TD5 axle which is a Rover type but with a 4 pin diff, which is one of the jobs that the racer needs as I bent the salisbury quite well last time out but we're still waiting for it to be strengthened.
Ah yes that's the third option, a Wolf axle but not easy to come by.
Regards
Wolfie