Harley-Davidson Motorcycle 5.25" to 6.5" Speaker Adapters. Looking to upgrade your factory speakers on your fairing based HD motorcycles? These Speaker Rings will convert 5.25" factory speaker openings to allow for the installation of 6.5" higher performance larger format aftermarket speakers of your choice without fitment issues. Speakers shape prevents the need for new speakers from resting on sharp edges, reduces potential frequency cancellation and improves overall output of sound by allowing for smoother sound transition to the factory speaker opening without narrow platform step mounting like other speaker rings. No modifications necessary. Easy installation. Full installation directions are available (buy one today then request right away) . Installation mounting hardware included