6810s from Ebay are a possibility. I found a vendor who did sell me the correct mirrors. I can PM you his Ebay Nom De Gurre,,,
Slow, but likes a big mirror. Tunes up on older DT amps.
If you like very big beams....
I have three working sets of Cambridge 6350s I need to get rid of. However they are 1. HUGE and the Amps are 2. VERY BIG. (you'd need to design a plus sized , over weight, projector ) ;-)
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...