im confused with what you are asking for?
you talking about the post that holds the cable to the battery?
i dont think these are normally brass tho.. it is a soft metal..
or... are you talking about a spacer that fits inbetween both the cable and the battery cable?
this...
http://www.maneywire.com/thumb.php?i...pg &w=75&h=63
these can be bought at auto parts stores, and also car stereo install shops.