These reducing rings are perfect to reduce the neck size of a RamAir Universal filter, these reducing rings fit in the neck of the filter and allow you to have larger neck sized filter to fit your vehicle.
There are 4 reducing rings supplied. Their sizes are...
90mm to 85mm
90mm to 80mm
90mm to 75mm
90mm to 70mm
These ring allow you to step down any 90mm internal diameter Ramair Cone Filter to suit your application.