73 Duster Brake Booster

i bought a rebuilt booster from Rock Auto for my duster and it’s junk. Where can I buy a new booster. Everything I find is universal which is ok. But I want to ensure It bolts straight on to my car. Any ideas. I have checked usual places summit, Mancini, speedway, classic industries etc but they mostly come in kit with Mc and bracket which I don’t need.