If I understand you correctly you are looking for the saddle bag liner kit that provides a liner much like the inside of a car trunk. They can be found on E-Bay from about 35 bucks on up to about 60. If you are looking for the saddle bag liner luggage then again they can be found onE-Bay for around the same price. I purchased both on E-Bay with no problems and they fit and work great. Look at the sellers personnel web store, if you purchase both at the same time you save on shipping.
Good Luck