i was browsing mazdatrix's website looking for all the gaskets i would need for my TB mod but i cant find ones for either side of the TB itself isnt there gaskets there?

and why is the damn turbo to down pipe gasket cost so much from mazdatrix but if i go to RP (rx7.com) i can get that gasket new bolts and nuts for like $22

 

There are not any gaskets that need to be replaced when doing the throttle body mod