i need the left casing for my nc29, will the one of the nc23 fit it . http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... :IT&ih=007" onclick="window.open(this.href);return false;

i also want to kno what it the thing that bolts inside of of the left case with the wire coming out ?

Yes, it'll fit. You need take out one of pickup sensor. But this is easy. This is bolt-on. Also casing from CB400SF/CB1 also fit, because they have similar engines.