I had the same problem with my feet so I obtained these. I have sold my Cab 12 and I no longer need them.
I took these left and right inners to the Corowa Swim-In and no one wanted then so I brought them home. Might save butchering another pair or change yours and keep these for returning to original later.
Postage might be a problem but there are here if wanted $15.00 each plus freight.
Regards Rick