James,
I am cutting a lot of rings here in the next couple weeks for a project boat im getting ready to do. I will be doing some for the Kicker in-boats as well as the KM6500.2 towers. My dimensions for the KM6500.2 are as fallows: ID = 5.958 (which leaves room for the .270 thick LED strip) and OD of 6.835 which is flush with the OD of the grill. Id be happy to cut 4 for you. The edges will be semi frosted so you can polish them of sand them for a more opaque look. PM if you want to work out the details.
Michael
Mikes Liquid Audio