Thanks for the reply Ed. The model number under the motor is listed as 16600. I would think it is considered a 1660. Possibly when the 1665 and subsequent models were manufactured they could have dropped the extra digit, but maybe everyone is just shorthanding it to 4 digits. Anyway, it appears to be exactly like the pictures in the gallery and product sheet. I have ordered it betting on the fit.
My shop is only 17 x 14, but I have many machines. I would like to fit a 14" cyclone in there, but its a tight fit. My plan is use this mini, and wear a dust mask until I see how well it works. I should probably wear the mask regardless.