55 rear view mirror p/n
 

I have a rear view interior mirror that I'm trying to identify. It appears to be New Old Stock, it is in a Chevrolet vintage box, with the part number 986948 printed on the box. I looked around the 'net and I believe it is the correct mirror for a 1955 Corvette or other Chevy. Would the difference only be the Windshield arm?
I have a bidder that is asking me to verify the application and I told him I honestly am not sure, but that I would ask on a Corvette forum where users would know.
I dont want to misrepresent it. Can you help ID it?
Thanks!
James