gas tank conversion problems

[awitate]

Everybody says this an easy project. So far i've had to remove the rivets on the spare tire cross bar, notch the cross sill bar, drill 2 holes on the frame and i've also notched a piece out of the frame to allow for space for the filler neck on the tank. It seems like 1 of the tank straps is inside out. my Question is do i need the straps? Can I bolt the tank to the frame and call it a day. I can't figure out why i need the straps. I'm using the metal 69-72 blazer/suburban tank from american classic. This tank looks exactly like the tanks from everybody else. This is going on a 63 short bed fleetside btw. I have looked at tons of posts but there are too many variations to find the answer i'm looking for.
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