I just checked Mazdaspeed...a set of OEM front/rear control-arm bushings are around $350!
Flyin' Miata has front/rear poly bushings for around $220 total -
http://www.flyinmiata.com/index.php?...umber=13-98111
http://www.flyinmiata.com/index.php?...umber=13-98110
I'm going to take a wild guess that poly bushings aren't legal in stock class? :punchout: