The reason I mentioned the Allparts is that it has the two extra anti-lift screws, which the '72 one wouldn't.aceonbass wrote:Putting an Allparts or current 4003 tailpiece assembly on a vintage 4000/4001 that had a cast aluminum one will lower the bass's value by about as much as it would cost to find a correct replacement. Either modern replacement tailpieces will require drilling two additional holes in your bass to keep them from lifting.
Of course, were the time come to sell, the OP could put the original one back on it.