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In all engines from 1986+ (prior to RX-8 engines?), the water jacket o-ring grooves are located on the side irons.
In 12A's, the water jacket o-ring grooves are in the (aluminum) rotor housings.
I cannot confirm that the grooves are identical in dimensions.
Also, because of the above facts, you cannot swap side irons.
Please, if you don't have solid experience with the items in question, don't spread misinfomation like this.
-Ted
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