I just pulled out some NOS A/C A6 Delco compressors I have been saving.
I seem to have 3 size clutch/hubs. they are approx: 5" 6" or 7".

What are the applications?
Is the 7" one for the 64/65 Corvette 365hp A/C car and valuable?
They are all remanufactured by Delco, in GM boxes. - Old Stuff.
Any idea of the value?