i am thinging to get for my car the hks 4-2-1 manifold but i dont know if they will fit i have an ss-iii st-202 and they are for the ss-ii st-202 does anyone knows for sure?

My 2001 HKS Japan catalog says that the header is not to be used with the Beams engine. I'd hope that HKS went ahead and made a header that would work for you since then, but I just glanced at their website and it doesn't look like it.

Super Header II Info

Maybe someone who can read Japanese and knows some automotive terminology can help decipher what's written, or perhaps someone with your engine might've tried to install the header.