> That's the exact spare tire I have on my '82 T3 here in Australia. :)

The reason you still have it as a spare and the reason I had one
for so long with my '81, is because in those old days before
the glaciers receeded and when radials were new, the advice was to
rotate front-back but never cross to change rotation direction.
Either radials got better or advisors got smarter, or both,
but now a 5-tire rotation will benefit you, after the expense
of that 5th tire, by keeping you from ever having a 31-year-old
spare again....

The air-cooled T3s are hard to keep going since parts are hard to
come by, or impossible, but it's worth it.  After all, they
are the REAL T3s!  :-)

Richard