I bought 2 battery posts for a new car stereo I just installed. The positive post was larger than the negative post and fitted fairly snugly. However, the negative post was too small even with the spacer they give for the smaller post. My battery posts may have been smaller than usual so take that with a grain of salt. I was dying to assemble everything so I used some copper as filler between the pin and the connector (mostly small copper wires from a 0GA wire) and it worked great and now it fits just like a positive pin. Ha as described, really correct. My 0 ga welding cable (true AWG specs) is perfect for 0 ga output as well as 8 ga and 2 ga outputs. I highly recommend them, but be careful not to damage the screws if you overtighten them.
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