A conversion neck is one that can convert an instrument from one scale length to another with no other modification. A common conversion is 34" to 32". By overhanging the 20th fret, or leaving it off, you can use the stock bridge location on the body, just adjust for intonation. Such a neck will work on any standard bass body. A conversion from 34" to 30" requires overhanging two frets, or losing one or both.
Getting back in the saddle - I wrote the PHP code for the sidebar navigation, as nothing very good seems to exist in the WordPress world.
The main navigation node at the upper-right shows the path to where you're at with a breadcrumb trail, the page you're on, and any siblings and children. It also incorporates the Blog.