eBay
This listing is for one pair of vintage Magnavox  8" woofers , made  by Rola.  The frames measure 7 5/8" across & 8 1/4" ear to ear on the diagonal. Voice coils are 1". Both have been tested & sound good. Impedance is 8 ohms. DCR= 7.7 & 7.9 each. Each woofer has the following markings on the magnet: 580818-1, 21347 & 285745.
 Though not capable of handling high power, I found these speakers to have an excellent tonal quality. Would be great as a electric guitar amp speaker.