IIRC - Elias had to put that neck on that guitar as the only Japanese reissues with B&B were CA Red and Lake Placid Blue. I dunno, it's been over 10 years so my brain's a tad rusty. Don't remember where he got it.
The quest in Right Handed might be easier, you may just be able to dial up a neck through Warmoth, or find one of the parted out ones on e-bay. They do get them from time to time but they tend to be a bit more expensive than buying a secondhand dot neck. The models with the blocks & Binding are the Japanese 66' Reissues, and the 50th Anniversary Jaguar. Vintage necks tend to be extremely expensive as B&B necks are not that common - Fender started installing those on Jaguars in late 1965/early 1966 and that was well after the Jaguar's surf heyday so they did not sell too well.
I saw they put B&B on the Squier VM Bass VI, I always thought they should have made a Jaguar variant like that. I want one because eventually I want to build a pre-Kurt build of Cobain's Jaguar (basically a Martin Jenner Jag).