Buying and Installing VX1 BMS - Universal Battery Management System

So I had 18 nissan leaf packs (36 cells) in my 2007 Vx1 and I've blown one. I have a semi automatic balancing system which I wasn't paying close attention to. So currently I have 34 cells (17 packs) can I buy the 38 cell UBMS and configure it so that when I get one or two more packs I can add them in? Also I'm guessing but can you confirm that the unit fits in the seat space and that it comes with all instructions to connect to the canbus for viewing with the vectrix diagnostics?