There was a forum member several years ago that did some serious research into reproducing presentation case liners, even talked about making them from more substantial material that would better resist cracking. He found that the cost for a short run would be prohibitive. I am a Tool & Die Maker experienced in producing tooling for molded parts like the insert, just some preliminary investigation and I drew the same conclusion. Best to repair what you have, I had a forum member other than Joe Cebull repair one of my cases and the job turned out great. Once repaird from the bottom and reflocked the repair is invisible and the result is a stronger insert not liable to crack again.