looking into getting either the KMC slide wheels or KMC dimes and they come in the offsets of +15 and +35.

which ones are correct for a '96 f150? sorry I haven't researched this much

 

Do you want the tires to stick out at all? If so, you'll want a wheel with a negative offset!

And sorry I can't answer your actual question, as I believe both of those will be very close to where the stock wheels sit

 

It would help to know how wide the wheels you are looking at are since that will help determine offset and backspacing.

But they should fit fine.