Exterior chrome metal round rear view mirror
FIAT 124 Spider and Spider 2000 - 1966-1982
This high quality universal chrome mirror is 4 1/2" (114mm) in diameter
Mounting holes are approximately 3.5/8" (92mm) apart - The base is the same width as the remote mirror's hole on 1979-82 Spiders, so it would have to be positioned very precisely to cover the opening.
Fits either side of your 124 Spider