Bartolini mk1 swap for Nordstrand Big Singles?

I've looked at countless threads about replacing mk-1 Barts from the Ibanez SR series to Nordstand Big singles.

Problem is, I can not find a confirmation from anyone who was able to swap them out with a 4 string or not. There are some size difference so just wanted to test the waters and see if anyone has pulled it off. If not, any suggestions for replacements other then the USA Bart M4?

I am in the process of switching out the preamp with Aguliar OBP-3. I am also considering swapping the bridge and neck pick ups to their "recommended" positions (Ibanez installs them backwards because... reasons I guess)