I have a pair of 508 brought back in 1996.

I will need a center speaker for assembling a 5.1 system.
I have no room size for a 3rd 508S

I will have to go for a "regular" center speaker (smaller).

-Can you advise me on a center that will match the tone and timbre from the 508's?
-What model/brand is better in my case?

Sincerely
Carlos