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That's not a boot and it's not made of rubber... at least on these Bumpsides. I refer to it as the coil spring seat. 5A309 is the coil spring retainer (a large metal washer)..
FYI.. later Econolines had a slightly different spring seat with a hard, nylon-like insulator to reduce vibration. They can be retrofitted to Bumps but you'll need both the seats and the insulators because they dimensionally mate to each other.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.