Here's some info I found out......need to get feedback from the guy who bought these for his VX.

"Dear Sir
We are Hot Bits Australia and we have a sister company in Malaysia The
part numbers were listed by the Malaysian company , we both produce Hot Bits
products however at this time only the Malaysian factory is producing the 4
WD range as we test all of our product under Australian conditions ( which
are very different ) before release however if your club member is happy
with his purchase and you wish to fit a set of the Malaysian units
we can
bring a set in for you priced @ $ $700 per set of 4"