I'm a newbie at this forum and i need help with parts for my 1974 rotary mazda pickup

[antonio99301]

I have a 1974 mazda rotary pickup that i recently aquired and i know nothing about rotary engines. to make a long story short. i was told that to get the truck running i need to put a whole new exhaust on it because it was completely missing (somebody saw the truck sitting and obviously needed that part). I do have the exhaust manifold but nothing from there on. Is there a cheaper alternative to the hundreds of dollars that the parts stores want? anyone here maybe have one for sale? and something about a thermal reactor? Please help