The Honda one does spin in the opposite direction however still provides a noticeably improved airflow over the original 240z fan. I can't remember what the numbers were but did test it with an anemometer that I have
Amayama website :
Pistons 41122-68200, currently $33 each
Pitwork seal kits, AY600NS074, currently $60
Postage $15
3 months generally for delivery
Total for 8 pistons and a seal kit delivered $339
Looks like this one is probably sold, If anyone else would like one of these kits or new pistons send me a message. I do an order ex Japan once a months so you'd be looking at a 4 weeks wait.