Just wanted to update incase anyone runs past this down the road
I talked with Mark @ Bentfab the other day and he just uses the standard hose union fittings in between the fuel filters and pump. He prefers to have the filters separate from the pump but as in my case it doesn't always fit like that.
So if you are looking for double o-ring fittings just use a standard an union, the an/o-ring fittings are at least twice the price of a standard union also so you can save a couple bucks
