the small bullet connectors (gold) fit better than the spade connectors. spade connectors (especially the automotive type) will be tough to pass through when you factor in some type of shielding and in general crimped connectors are horrible! solder is the way to go!
I'm using bullet connectors to pass wires through for my Ultimate Tracer unit. Stagger the connectors so that they don't sit side by side. use opposite connectors so that you can't plug a battery in backwards. the rubber covers will still fit through the delta ring/receiver. I've even used heat shrink under them and they still fit.
edit: these 4mm bullets will work but no rubber covers. use heat shrink.
http://www.innov8tivedesigns.com/pro...products_id=65