You can't get the racing seats in GT3/RS either here in US. But you can get them in GT2 and now even in Cayman S (it is new for Cayman S I think - so may be the regulations that stopped these seats from being available here in the US changed).
Here is the optional Cayman seat (same as in GT2 I think)
On the other hand, you can't get the new racing seats BMW is offering for the 1er here either. And even for M3 the lower portion of the seats (not the backrest) for US cars are diff from the Euro spec (it is same as normal E92 with less aggressive bolstering).
US spec M3 seat:
Euro M3 seat:
