It's really really tight but doable. I had the East in there and switched to the Nordstrand. Outside of the active blend on the East I preferred the Nordstrand. With the East there is no room for switches also.
This is the preamp I put in my 5005
Nordstrand 3B-5b - PREWIRED – 3 band bass preamp with volume (pull passive), blend, tone, push pull frequency selector on mid, and treble/bass stack
East is undoubtedly more flexible and sounds great, but I found the Nordstrand easier to dial in a great tone quickly. Couldn't get a bad sound out of it really.
Can't go wrong with either.
Big thumbs up on the Nordstrand 3b pre-wires. I've installed two--both of mine have a ToneDrop that works in active or passive mode. I recently installed a Mike Pope 4-band from Trickfish that was even easier to install. But like you, next time I need one I'll probably go back to Nordstand--it adds almost no audible hiss when switched on, which puts in the same rare class as Glockenklang and (so I've heard) John East. The Nordstrand uses EQ points modeled after a Sadowsky design. It's clear, clean and is easy to dial.

