It fits an Epi better than the original due to the different neck heights. The fit for a Gibson is soso and strained. The one big structural dif between a JC and a LP Signature is that compared to the body the neck was much lower on the Gibson (which is why you have to have the three point so low on these things that there is hardly any space). It's obviously one of the things Jack C. had improved when they redesigned the bass for Epi.