The "bustle rack" and the "turret basket" are two different things. A bustle rack is named after an old fashioned lady's bustle skirt which is a wire support that gave them a bigger butt under their dress. See the center model below.
The turret basket is the portion of the crew compartment that rotates with the turret. Previously on older tanks, the turret was separate and the crew had to "walk" with the turret as it rotated. A basket was added under the turret and the crew could now be seated and rotate with the turret. The turret floor is the bottom of the turret basket. The area under the turret floor is called the sub-turret floor. A black hole where hand tools vanish.
This is a turret basket, a basket hanging under the turret.
Bustle rhymes with hustle.
Bogies sound like the actor's name.
The rails on M48, M60 and M1 tanks are called "grunt rails" even though infantymen no longer are able to hang onto them (as on the Abrams tank). Grunt rails are on the side and the bustle rack is on the rear, although today, they rails basically continue around the back to become the bustle rack on an Abrams.