All the PBG routs for JB pickups are for the non-standard size pickups that come with the kits so a bit of enlargement is always required when using different JB pickups. We have asked via Adam that the factory find a standard size jazz bass pickup to use, as not everyone feels confident enough to do the enlargement required, and a lot of people end up fitting replacement pickups. But nothing seems to have moved on that front so far.