LMC Fuel Tank Questions

[Coursey]

I have a 1971 c10

Was looking to install the LMC Blazer fuel tank conversion w/ side fill.

I had a few questions before I buy.

1. Do you have to modify the frame to clear the side fill?

2. The side fill is a 21 gal and the top fill is a 17 gal. There is a 1" difference in height on the two tanks. Is the 1" setting closer to the ground or the bed?

3. Any pics showing height difference?

4. What is the diameter of the fill tube and vent tube?

5. I was looking at using a Late model ford fill neck (the ones with fill through cap) and hide it behind the side marker light. Has anyone tried this?

6. Is there a different (low cost) option that i should look at?