i have a 87 non turbo 13b with stock tranny and no one seems to carry any info on the stock sice clutch and clutch plate. not even mazda!! (which by the way doesnt even carry parts on hand anymore for the 1st or 2nd gens) however back to my point, someone who had the car before me said they put a clutch in it and now is spread all over my tranny in millions of little pieces and o i cant measure the one he put in to find out if its the 9inch or the 8inch disc, any help would be greatly appreciated.

take it sleazy,
steve

225 mm.

Here is some info

http://www.mazdatrix.com/f86-92nt.htm

RX-7 Store-Non-turbo Street/Strip Clutch (http://66.216.67.51/product.asp?0=206&1=241&3=20)