On the subject of LED retrofitting generally, an advisory:
Depending on model year, some of the aftermarket products that can be adapted to existing Interstate light fixtures are stick-ons (adhesive-backed; the exception in our model year is the puck lights in the ceiling and adjustable spot-lights, which are two-pronged... I can't recall off the top how the porch fixture was configured).
The adhesives are advertised as being super strong, yada yada, and as long as the light fixture remains off, it may indeed take the strength of Atlas to pry them loose from their positions.
However, once the fixture is turned on, it heats up and the equation changes. We've had several in which the LED wafers came loose and started flopping around in their fixtures. In the case of the closet ceiling fixture, we did not notice this right away, and the LED resting up against the plastic fixture cover began to actually melt the plastic cover.
So, beware of this possibility.