What I ended up doing was finding and purchasing a 440 pump with the outlet fitting for tube but the inlet is a 3/8 nipple and the tank line is 5/16. I don't know if it's accurate since the fittings are parallel to each other. I think the OE fittings may be pointed away from each other like one on EBay right now claiming to be correct for $200.00. (pic attached)
Are 440-4 3/8? or just 440-6? Anyway,I'm OK with the one I have since it was less than half the price. I was able to stretch the hose onto the 3/8 nipple and used a 3/8 Keystone clamp.