ICAR, 10 mins from home! My car is made in Japan too...
I called the dealer and here are the parts no:
Are you sure about the rear? I'm guessing that it's b4y0264
Assuming that's the case, then the part numbers are the same except that yours end in the letter 'a', and mine end in the letter 'b'. That leads me to believe that the race pads will fit your car, but unless you want to take a chance, somebody who knows more about these part numbers would need to confirm that this is true. I also have no idea who that person might be!
Another option would be for me to lay the pads out on a piece of paper, trace outlines of the front and rear backing plates and brake pads, measure them for width, height, and thickness, mark those measurements on the outlines, and then send you an image so you can compare those shapes and sizes to a set of front and rear pads at the dealer. Let me know if that's of interest to you.
I will tell you that I paid US $503 for the pads, so if these are something you really want then going to this extra trouble may be worth it. From what I see going on in the aftermarket, real race pads are likely to remain special order items for these cars. It's a shame, but I've come to the conclusion that there are very few owners who are potential customers for hardcore upgrades.
There is yet another possibility. I go up to Tremblant at the end of July every year, and if I still have the pads at that time I could stop by. The backing plate shapes will either match up perfectly, or they won't, and the pads will either drop right in, or they won't. We'll know right away if they fit or not.