GP's in-house made CNC Dual 6.5" Flush mount Speaker Rings.

Inner Diameter: 5.85"

Flush Diameter: 6.8"

Flush mount depth: 0.25"

Outer Overall Diameter: 15" x 7.5""

For 6.5" Speakers with a mounting diameter of 5.85" or smaller. 

Also fits Deaf Bonce M61AE M61AC M67AC M61SE M60SQL and many others.