Saddlemen Medium Saddlebag Liner - 3501-0605
They have worked well for me in my OEM panniers. I won’t say they are a 100% perfect fit, but you can always tuck some small things around the perimeter and put some more things under the OEM elastic bands to fill the space in the lids. See my pictures. The price is $18 shipped (in a flat rate box that will cost me like $11.95 I think). They have a metal band around the edges to keep their shape and I will have to bend them slightly to get them in that box. First person to send me a PM that they want them and sends their address, gets them. I will send them to you and when you get them you can send me a check for the $$.