I was just dismantling the sub frame on my parts rx7 a few days ago.
All I can tell you is, I remember the size being 21mm. Among other sizes, 17 and 14.
Cool that you found them off other mazdas.
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'89 RX7 GTU, half-Bridge-port S4/S5 NA, E6K, Full RB exhaust, weekend warrior.
'83 RX7, The "this might take awhile" project.
'87 RX7 GXL, Rest In Pieces.
'98 Subaru Impreza Outback-sport, rx7 rescue vehicle, down for repair.
'94 Ford Ranger, daily.
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