site is very dodgy. hard to find sellers in Aus now (yeah those particular plates are standard)
mine look like these but 20's..
they are olympic hole size
anyway, they are the plates they are using in the video above...
can see "YORK" clearly at 1.50
in UK
York Hammertone Olympic Plates (1 x 20kg)
uncalibrated (same as in the vid) =
York Barbell USA - Where it all began...)
more fancy =
York Barbell USA - Where it all began...
EDIT: actually the ones i have are labelled "YB", but they weigh up within +- 50-100grams for the 20's
30mm thickness for 20's, 435mm diameter (they are probably the cheapest version?)
call York directly and ask for a distributor?
York Barbell (Aust) Pty Ltd > Sydney Region NSW | White Pages Australia
Rogue has some.. maybe York copies?
WEIGHTLIFTING PLATES - STEEL PLATES - Rogue Fitness Australia
PS, there's 100kg of York 20's on ebay atm. (not in brissie tho)