relocating gas tank

[70Custom10Nut]

has anyone out there put a Blazer/Sub tank in a LWB pick up? I want to do this, but after looking at clearances between the bed and frame, I see I'll have to cut into the bed for a filler neck, and fabricate a shield inside the bed box. What I want is to have the filler neck behind the wheelwell, something like the Suburban does. Does anyone know where I can get a filler door assembly with the hose set up? I know this can be done but I haven't had the time to really research this yet. I just got my truck out of mothballs, and I'm ready to get to work on her again. (I just returned to the states from being stationed in Europe for five years). Any kind of advise would be great. One other piece I need is the detent spring in my tilt steering column (broke it when I put in my new lever). My pride and joy (other woman as my wife calls her!) is a 70 Custom 10 (Med Olive w/white top) that I've upgraded with factory options (power steering, Pwr brakes, tilt wheel, factory Bucket seats, headliner) to the point that the only things missing are A/C and the vacuum gauge. I'll post some pix later