well i have never used an FD pump on a 12a, BUT i have used an FC housing on a 12a with the 12a pump. That connected right together without any issues. Being that i used a 13b housing on a 12a, i can't see why the FD pump assembly wont work. The only issue i had was created but using the aluminum 12a pump with the aluminum 13b housing. The alternator mount portion doesn't line up to give you a place to connect the tension bracket
what i did instead was pull one of the studs out after mounting and used a long bolt instead. Then i modified an air pump bracket to work.
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