The ones for the fender are a different size from the ones for the quarter panel. The fender bezels are longer & thinner than the rears.
Also, if you buy the repro reflectors from PG Classics, they don't fit the rears unless you grind them shorter. They made the front (amber) & the rear (red) the same size.........they're both sized for the fender bezels; longer & thinner.
Just an FYI for ya!
George