You get a PAIR (2) of 6" x 8" to 6.5" speaker adapters with your chosen inner diameter with a depth of 5mm.
If you need more depth, Select the 'thicker than normal' option and use the 'note' function when you buy to include how thick you need! IF YOU SELECT THIS OPTION BUT DO NOT TELL ME A SIZE YOU WILL GET THE DEFAULT 5MM THICKNESS.
I purchased the Scosche SA68 to convert my Ford's 6x8 speakers to 6.5". They did not fit! There is no way those adapters will work with 6.5". If you cut away enough material to make it fit you will have nothing left. The comparison is in the last 2 pictures.
So I designed and 3d printed these in PETG, a high temp resistant thermoplastic.
Need an unlisted inner diameter size? Let me know!
Outer diameter: 6.5" (165mm)
Thickness: 0.196" (5mm)
Length: 7.95" (202mm)
See pictures
They are stiffer than the SA68s.
You will need to mark and drill the mounting holes for the speaker itself.
BE SURE TO CHECK YOUR SPEAKER'S INNER DIAMETER.
6x8 to 6.5": https://www.ebay.com/itm/114339188366
6x9 to 6.5": https://www.ebay.com/itm/116520322946
6x8 to mid/tweeter: https://www.ebay.com/itm/115933769356