It's been about a year since I installed my fass 150 and it's about time I install it into the factory fuel filter and I am a having trouble finding the correct fittings to make it work. I am sure I'm just overlooking something but what exactly do I need

I thought the Fass 150 came with filters. I so you do not need the factory filter. You can use the oe filter if you want by just plumbing it straight from the pump to the canister. Then get a big line kit from Vulcan Performance to plumb from the oe canister to the VP.   I use my oe canister with my AD and the big line kit. I use it for the water separation and the fuel heater. 

Thanks that's what I was trying to do and I wasn't sure of the bigline kit would do it 

It will open it up from stock but is not 1/2" thru all of the connections. But the inlet into the VP is not either. You will have good fuel flow using the big line kit. DAP has one also but I think it is the same kit.