I've got one of each in my jeep, and wish I would have went with two spools. The mini-spool in front caused some problems with the axleshafts not sliding all the way inboard, nothing a cutoff wheel couldn't fix. Wouldn't have had that problem with a full spool.
Complete Offroad has spools for around $90 or $99, and mini-spools for $60, for the D44.