Not a fan of Torx screws but I guess I have to live with them now.

I do have a cheapy 'security screw' set but the bits are soft & too small for the larger bolts used on a Harley.

I don't want to butcher these screws leaving me to try to drill the heads off.

Where (in Sydney's west) can I buy some good quality Torx bits & any needed adapters to suit a 1/2 inch

drive socket set?

In particular I want to remove the top, front engine mount bolts on a 16 Sporty to fit a driving light bar.

Also, is it the norm to use thread locking compound on fastners on Harleys?  New to these bikes.

anything to do with nuts or bolts or anything related to them. I have always gone to Lee Brothers, they also stock tool's and would sell quality. they have been around for generation. I can't remember addy offhand but they are in a street near parra Gaol.

I just got a full set of tools from total tools and even though I haven't done much with them yet I have test fitted a few including a number of torx drivers 1/2 inch drive, compared to the cheap set I have the fit was very tight with no slack. All the tools seem to be very tight tolerance but as yet can't testify as to the hardness but as you say you don't want to strip the heads so spend a bit more for quality. 

I guessed so.

They do vibr .. Have character!

I'm in the process of changing the torx bolts to hex dome bolts instead.

Yeah....NEVER red unless specified in service manual.  Green Loctite works too,