It was a bit different here in the Netherlands..
The Leather Interior option could be ordered on any Weekend.
Depending on which year and which type, it had side airbags, heated front seats and 2 or 4 electric windows.
The St. Moritz was standard equiped with a velour interior, side airbags and 4 electric windows.
I've built in the leather interior myself after picking one up from a HLX without the side airbags but with heated front seats and 4 electric windows.
It's a better choice if you have two dogs and a daughter with muddy shoes etc. from horseback riding.
The heated seats are actually nice in the winter. And sweating is no problem providing you keep the leather well maintained.
Of course, the airco helps as well..