GuitarPartsDepot is supposed to carry ESP/LTD replacement parts, but I didn't see the exact nut you were describing there. There were 40, 43, and 45mm preslotted graphite nuts, which are probably pretty close to the original.
http://guitarpartsdepot.com/Merchant...egory_Code=BNS
AllParts has many different types of bass nuts..
http://www.allparts.com/store/nuts-saddles,category.asp
StewMac sells nuts and blank nuts, ranging in price and materials.. Might have to cut your own to duplicate the spacing on your bass.
http://www.stewmac.com/shop/Nuts,_sa...ring_nuts.html
The strings that you've mentioned are pretty-much a standard medium gauge.. Should be able to go with a preslotted nut for that bass.
You might want to call GuitarPartsDepot and ask about direct replacements.. You'd probably be looking for a nut from a F-254, F-204, or maybe even one of the TA-200 or 600 series basses..
Mag...
