Going to post this here as it's not really an "accessory".
This is kind of an unusual item to run across.
It's an unfinished, undrilled body that would have been for a (discontinued 2002-2009, $3000-$4500)
USA Spector NS-2J-FM http://www.spectorguitars.com/models/woodstock.html
(3rd bass down, after the 2 Codas).
The reason this is an NS-2J-FM (FM=Flame/Figured Maple) is it's bridge route dimensions match the Hipshot B bridge (Fender 5 hole style).
This is the only bolt-on JJ configuration by Spector to use this particular bridge.
It's the only model it can be.
I play Spectors exclusively and bought this to build a project with a Spector neck I ended up using for something else. Not going to have time for this in the forseable future.
The USA and Euro neck pockets seem to differ slightly.
A ReBop neck could work with some slight shimming.
The pocket is about 1/16" to 1/32" wider and a little less than 1/8" deeper (front to back)
than the standard Euro/Czech bolt-on (ReBop, NS-2JAR, etc.).
$210 PayPal shipped in the continental US is what I have into it.
One of those little Markbass practice cubes. Would prefer the 8" version, but wouldn't turn down the 6 1/2" version.
This is a pic of the actual model owned by another TalkBasser. I believe the crown inlays could be added as an option: