I bought a set of of the Tie Down Hooks from FordParts.com back in April 2020 for $6.49 each, now they are $31.66 each. The bolts remain the same price at $3.90 each.
I'm looking at getting a Kicker Key200.4 or Alpine KTA-450 amp and installing it in a super cab. Any suggestions on where to mount the amp other than under the rear seat compartments?