Ran across these tonight while consolidating some G body parts in storage.
I have seen this subject come up a few times, so I thought I'd post it up to illustrate the differences.
On top is the bracket for the sweep style speedo bezel #463413
Left lwr is for the 78-81 round gauge bezel with dash mounted wiper switch. GM used this through 1985 even after they moved the wiper switch #463414
Rt lwr is for the 1986-88 round gauge bezel with column mounted wiper switch #14086212
These apply to the Malibu, El Camino, and Monte Carlo
The 86-88 bracket is sturdier than the early one, not sure if there are clearance issues with an early bezel and late bracket...time will tell when i make the cluster swap.
I have seen this subject come up a few times, so I thought I'd post it up to illustrate the differences.

On top is the bracket for the sweep style speedo bezel #463413
Left lwr is for the 78-81 round gauge bezel with dash mounted wiper switch. GM used this through 1985 even after they moved the wiper switch #463414
Rt lwr is for the 1986-88 round gauge bezel with column mounted wiper switch #14086212
These apply to the Malibu, El Camino, and Monte Carlo
The 86-88 bracket is sturdier than the early one, not sure if there are clearance issues with an early bezel and late bracket...time will tell when i make the cluster swap.