Rotary Car Club - new member

hi guys my name is Danny n my sons name is Jonathan. i have been into rotary for a very long time my first car was a rx3 4 door it was the fastest car in my block i was 16 i didn't know y this car was so fast until a friend told me about rotary i was happy but like a young guy i didn't know what i had and had to sell it but since then i have gotten an rx2 ,rx7, rx2. right now i have a 1973 mazda rx2, and my son has a 1988 mazda rx7 turboII shell. it has no motor jus a trans and no interior what so ever except for the steering wheel and gauge cluster and center consel. and my rx2 is the same way. we both want the same setup we both want to put a 1993 3rd gen engine in each car but we want to know which is the best crossmember to get and where can we get it and how much will it be.is there anyone out there that can help us?