The Australian HQ is in Melbourne
There are no cross reference charts for World Lawn parts.
Parklander & Rover both sell rebadged World Lawn ride on so you might have some luck going there and looking at the 52" ZTR's
WL have a web page <worldlawn.com.au> and from there you can navigate to the parts book download.
If your WL belt No is 6001001 then it is a US B163 3/4K or an Aust B 160 3/4 Kevlar
Which over that length is close enough to a B160 ( standard size ) or a B 161 ( non standard size )
The parts book shows the belt routing around the deck pulleys .
Slip a ratchet tie down over the tension arm spring and run it to the back of the mower .
Tighten the ratchet to stretch the spring then slip the belt on & let the ratchet off.