Will you have to remove the spare tire well to install the older tank?
That's already done, got a huge hole there now.
What is it's capacity?
15.5 gallons
Are you having it boiled out before installation?
I drained all the gas, pulled the fuel pump, filled it tank with water, soapy water, water many times. Tt is completely clean. You could eat off the inside of this thing, LOL.
Have you checked it for rust?
It is very clean inside.