the HRC kit is for use with pre-mix, blanked power jets, open carbs and presumably race pipes too. Therefore all the sizes are quite big - they provide you with main jet sizes from 180 to 210, some number 40 slow jets and a range of needles besides a few other bits and pieces.

If you are still using the 2T pump, standard airbox and exhausts then you'd be better off buying different jet sizes from an online shop or your local MX shop maybe? A bit of google searching will find you a Keihin dealer. I think i remember finding a shop called cycletreads here in NZ who can supply carb parts - so there must be a shop in Aus who can help you too.
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After years of moaning about immigrants now i am one...