So I would like to upgrade my machine heads on my tokai les paul, its a few years old and the standard ones just aren't cutting it anymore.

but what brand?

how do I know if they will fit?

Is it one size fits all or do I have to measure something?

and anything else that would be helpful to me.

Also because I live in Australia I will be buying off ebay because its about 50% cheaper, especially from America so links would be helpfull.

That set is pretty much meant for Les Paul's, you will be fine.

Also, Sperzel is a very commonly used, there aree probably tons of people who put Sperzels on an LP.